CN118360515B - Nano TiC particle modified 6-series aluminum alloy and preparation method and application thereof - Google Patents
Nano TiC particle modified 6-series aluminum alloy and preparation method and application thereof Download PDFInfo
- Publication number
- CN118360515B CN118360515B CN202410776356.8A CN202410776356A CN118360515B CN 118360515 B CN118360515 B CN 118360515B CN 202410776356 A CN202410776356 A CN 202410776356A CN 118360515 B CN118360515 B CN 118360515B
- Authority
- CN
- China
- Prior art keywords
- nano
- aluminum alloy
- particles
- nano tic
- tic particles
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002245 particle Substances 0.000 title claims abstract description 222
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 167
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 102
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 102
- 239000007788 liquid Substances 0.000 claims abstract description 86
- 238000000034 method Methods 0.000 claims abstract description 50
- 238000007670 refining Methods 0.000 claims abstract description 46
- 230000008569 process Effects 0.000 claims abstract description 28
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 150000001875 compounds Chemical class 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims description 39
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 239000006184 cosolvent Substances 0.000 claims description 24
- 238000007872 degassing Methods 0.000 claims description 20
- 239000005543 nano-size silicon particle Substances 0.000 claims description 16
- 230000008018 melting Effects 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 229910018563 CuAl2 Inorganic materials 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- -1 Mg 2Si Chemical class 0.000 claims description 3
- 229910019752 Mg2Si Inorganic materials 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 238000009849 vacuum degassing Methods 0.000 claims description 3
- 239000000956 alloy Substances 0.000 abstract description 34
- 229910045601 alloy Inorganic materials 0.000 abstract description 20
- 238000005336 cracking Methods 0.000 abstract description 12
- 239000011159 matrix material Substances 0.000 abstract description 12
- 210000001787 dendrite Anatomy 0.000 abstract description 11
- 239000002105 nanoparticle Substances 0.000 abstract description 7
- 238000005266 casting Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000009736 wetting Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 26
- 230000001976 improved effect Effects 0.000 description 18
- 230000000694 effects Effects 0.000 description 17
- 238000005054 agglomeration Methods 0.000 description 15
- 230000002776 aggregation Effects 0.000 description 15
- 239000006185 dispersion Substances 0.000 description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 10
- 230000007547 defect Effects 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 8
- 239000012535 impurity Substances 0.000 description 7
- 238000007711 solidification Methods 0.000 description 7
- 230000008023 solidification Effects 0.000 description 7
- 238000004227 thermal cracking Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000006911 nucleation Effects 0.000 description 6
- 238000010899 nucleation Methods 0.000 description 6
- 230000035882 stress Effects 0.000 description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 239000000155 melt Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000011591 potassium Substances 0.000 description 5
- 229910052700 potassium Inorganic materials 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000008034 disappearance Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000004512 die casting Methods 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000000051 modifying effect Effects 0.000 description 2
- NROKBHXJSPEDAR-UHFFFAOYSA-M potassium fluoride Chemical compound [F-].[K+] NROKBHXJSPEDAR-UHFFFAOYSA-M 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910018134 Al-Mg Inorganic materials 0.000 description 1
- 229910018467 Al—Mg Inorganic materials 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- 229910017767 Cu—Al Inorganic materials 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 1
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 1
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000040 hydrogen fluoride Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052754 neon Inorganic materials 0.000 description 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/10—Alloys containing non-metals
- C22C1/1036—Alloys containing non-metals starting from a melt
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
- C22C32/0052—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents only carbides
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Signal Processing (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Powder Metallurgy (AREA)
Abstract
The application discloses a nano TiC particle modified 6-series aluminum alloy and a preparation method and application thereof, wherein the nano TiC particle modified 6-series aluminum alloy is obtained by adding nano TiC particles into aluminum liquid after remelting 6-series aluminum, the addition amount of the nano TiC particles in the aluminum liquid is 0.5-1.0 wt%, the particle size of the nano TiC particles is 30-80 nm, and the size of alpha-Al crystal particles in the modified aluminum alloy is 1-50 mu m. According to the application, nano-sized TiC particles are additionally added into the deformed aluminum alloy, and a specific fluxing agent is required to be added during addition to increase the wetting of the nano-sized TiC particles and an aluminum melt, so that the addition of nano-sized TiC is beneficial to refining an alloy matrix and a second-phase compound, eliminating dendrite structures, enhancing the fluidity of the alloy, improving the strength and the toughness of the aluminum alloy material and inhibiting the hot cracking problem in the casting forming process.
Description
Technical Field
The invention relates to the technical field of alloy materials and processing thereof, in particular to a nano TiC particle modified 6-series aluminum alloy and a preparation method thereof.
Background
Alpha-Al and eutectic phase grains in a conventional cast aluminum alloy structure are coarse, the alloy strength and plasticity are low, and the great increase of aluminum alloy application in the automobile and 3C electronic industries also puts forward higher requirements on the performance, especially the requirement on the performance when used as a structural part is more severe, and the conventional cast aluminum alloy cannot meet the requirement of bearing high load in strength and plasticity; the industry would like to use wrought alloys with high performance, but the wrought alloys are prone to hot tearing when produced using die casting and liquid forging processes.
In the prior art, three modes of in-situ endophytic method, powder metallurgy synthesis and nanoparticle addition are adopted to enhance the performance of the aluminum alloy and solve the problem of hot cracking. The Chinese patent application with the patent publication number of CN111118355A adopts rare earth element Er modified hypoeutectic to cast Al-Mg 2 Si alloy, refines alpha-Al and eutectic phases, but has limited improvement of alloy strength and can not solve the problem of hot cracking of deformed alloy. The Chinese patent application with publication number of CN112662909A discloses a die-casting aluminum alloy modified by carbide nano particles and a preparation method thereof, wherein the method is an in-situ endogenous method through chemical reaction between elements and compounds, and has the advantages that a required reinforcing phase can be directly generated in a material, so that an interface between a reinforcing body and a matrix is clean and pollution-free and is uniformly distributed, and the defects that specific reaction conditions are required to be met in the preparation process, the generation of byproducts is difficult to control and interface problems exist in some cases.
Disclosure of Invention
In order to overcome the defects of the prior art, the application aims to provide the nano TiC particle modified 6-series aluminum alloy, wherein nano TiC particles are additionally added in the 6-series deformed aluminum alloy, so that an alloy matrix is thinned, dendrite structures are eliminated, the fluidity of the alloy is enhanced, the strength and the toughness of an aluminum alloy material are improved, and the problem of thermal cracking is inhibited.
In order to solve the problems, the technical scheme adopted by the application is as follows:
the embodiment of the application provides a nano TiC particle modified 6-series aluminum alloy, which is obtained by adding nano TiC particles into aluminum liquid after 6-series aluminum remelting, wherein the addition amount of the nano TiC particles in the aluminum liquid is 0.5-1.0 wt%, the particle size of the nano TiC particles is 30-80 nm, and the size of alpha-Al crystal particles in the modified aluminum alloy is 1-50 mu m; the second phase compounds of the modified aluminum alloy include Mg 2Si、AlSiMnFe、CuAl2,Mg2Si、AlSiMnFe、CuAl2, each having a size of 1 μm to 10. Mu.m.
As a further preferable scheme, the addition amount of the nano TiC particles in the embodiment of the application is 0.5-1.0 wt%.
As a further preferable scheme, nano Si particles are added into the nano TiC particles, and the mass ratio of the nano TiC particles to the nano Si is (8-12): 1.
As a further preferable scheme, the yield strength of the nano TiC particle modified 6-series aluminum alloy in the T6 state is 350-370MPa, the tensile strength is 380-420MPa, and the elongation after fracture is 8.5-13%.
The embodiment of the application also provides a preparation method of the nano TiC particle modified 6-series aluminum alloy, which selects nano TiC particles, modifies cast aluminum and deformed aluminum through an external process, optimizes and improves microstructure of the aluminum alloy, improves strength and plasticity of the alloy, and inhibits the problem of hot cracking of the deformed aluminum in the casting process. The preparation method comprises the following steps:
Remelting aluminum alloy: melting cast aluminum or deformed aluminum alloy at a first preset temperature to obtain aluminum liquid, and controlling the temperature of the aluminum liquid to be kept at a second preset temperature;
Adding nano TiC particles: under the second preset temperature condition, adding cosolvent and nano TiC particles into the aluminum liquid in batches, and stirring the aluminum liquid while adding;
Refining: and after the nano TiC particles are completely added, adding a refining agent for refining in the stirring process, and standing after degassing and slagging-off treatment to obtain the nano TiC particle modified 6-series aluminum alloy.
As a further preferable scheme, the preparation method of the embodiment of the application further comprises the step of treating the nano TiC particles before the step of adding the nano TiC particles: adding nano Si particles into nano TiC particles, uniformly mixing and dispersing, and then adding the mixture into aluminum liquid in batches, wherein the mass ratio of the nano TiC particles to the nano Si is (8-12): 1.
As a further preferable scheme, the first preset temperature in the embodiment of the application is 800-820 ℃; the second preset temperature is 850-900 ℃.
In a further preferred scheme, when the nano TiC particles are added, the nano TiC particles and the cosolvent are mixed, the obtained mixture is added for 3-8 times, the stirring speed in the stirring process is 120-200r/min, and the stirring time is 2-4 hours after the cosolvent and the nano TiC particles are added.
In a further preferred scheme, in the preparation method of the embodiment of the application, the adding amount of the refining agent is 0.5-3.0 wt% of the weight of the aluminum liquid; the refining agent comprises the following components in percentage by mass: caF 220wt%-40wt%,MgCl2 KCl 60wt% -80wt%.
In a further preferred embodiment, in the preparation method according to the embodiment of the present application, the degassing mode is a protective gas degassing method or a dynamic vacuum degassing method.
The embodiment of the application also provides application of the nano TiC particle modified 6-series aluminum alloy in manufacturing the mobile phone middle plate.
Compared with the prior art, the invention has the beneficial effects that:
1. The nano TiC particle modified 6-series aluminum alloy is an aluminum alloy obtained by externally adding nano TiC particles into aluminum liquid after remelting the aluminum alloy, wherein the nano TiC particles can be used as effective heterogeneous nucleation sites to promote the nucleation process of an aluminum matrix, so that the grain structure is refined, the mechanical property and physical property of the aluminum alloy are improved, and the strength and toughness of the aluminum alloy are improved.
2. In the nano TiC particle modified 6-series aluminum alloy, the nano TiC particles can increase the hardness and strength of an aluminum matrix, and the microstructure of the aluminum alloy is optimized through the interaction with matrix metal, so that the mechanical indexes such as tensile strength, yield strength, elongation and the like of the aluminum alloy are further improved; meanwhile, by optimizing the microstructure, defects and impurities on a grain boundary are reduced, and the stability and creep resistance of the aluminum alloy at high temperature can be improved.
3. In the nano TiC particle modified 6-series aluminum alloy, nano TiC particles are used as extra nucleation points, so that the transformation process of dendrite to equiaxed crystals can be promoted in the solidification process of the aluminum alloy; the transformation can greatly reduce the thermal cracking property of the material, resist crack expansion caused by thermal stress, and indirectly improve the thermal cracking resistance of the aluminum alloy by optimizing the microstructure of the aluminum alloy and reducing the concentration and defects of internal stress.
4. The preparation method of the nano TiC particle modified 6-series aluminum alloy is characterized in that TiC particle modified aluminum alloy is added into remelted aluminum liquid by an external method, and compared with an internal method, the preparation method comprises the following steps: on one hand, the external addition method can directly add nano TiC particles into the aluminum liquid; on the other hand, the nano TiC particles are usually prepared in advance, and the size, shape, purity and other properties of the nano TiC particles can be well controlled.
The invention is described in further detail below with reference to the drawings and the detailed description.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an organizational chart of a nano TiC particle modified 6-series aluminum alloy according to example 1 of the present application.
Fig. 2 is an organizational chart of a nano TiC particle modified 6-series aluminum alloy according to embodiment 2 of the present application.
FIG. 3 is an organizational chart of a nano TiC particle modified 6-series aluminum alloy according to example 3 of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms "comprises" and "comprising" and their equivalents, when used in this specification and claims, are intended to cover a non-exclusive inclusion, such that a process or element is not described, but is inherent to the product, method, or structure, but is included in the application that is expressly described in the specification and claims.
The embodiment of the application provides a nano TiC particle modified 6-series aluminum alloy, which is obtained by adding nano TiC particles into aluminum liquid after 6-series aluminum remelting, wherein the addition amount of the nano TiC particles is 0.5-1.0 wt% of the weight of the aluminum liquid, the particle size of the nano TiC particles is 30-80 nm, and the size of alpha-Al crystal particles in the modified aluminum alloy is 1-50 mu m. In the scheme, nano TiC particles can be used as effective heterogeneous nucleation sites to promote the nucleation process of an aluminum matrix, so that the grain structure is refined, the mechanical property and physical property of the aluminum alloy are improved, and the strength and toughness of the aluminum alloy are improved. The grain size has a direct effect on the hot crack susceptibility of the aluminum alloy, smaller grains meaning more grain boundaries that can absorb and disperse thermal stresses, thereby reducing crack formation and propagation. Therefore, when the α -Al grain size is small, the thermal cracking of the aluminum alloy material can be reduced. Meanwhile, the grain size also affects the mechanical property of the aluminum alloy material, and more grain boundaries can prevent dislocation movement and crack propagation, so that the grain refinement can improve the strength, the plasticity and the toughness of the aluminum alloy; in addition, fine grains can also increase the plastic deformability of the material, making it less prone to fracture when subjected to stress. Of course, the smaller the grain size is, the better, and the too fine the grains may cause the area of grain boundary to be too large, thereby increasing defects and stress concentration inside the material, and adversely affecting the performance. Therefore, in the application, the regulation of the size of alpha-Al grains through nano TiC particles is an important factor for solving the technical problem of the application.
From the aspect of mechanical properties of aluminum alloy, the smaller the particle size of nano TiC particles is, the larger the specific surface area is, and the larger the contact area between the nano TiC particles and an aluminum alloy matrix is, so that the interfacial binding force between the particles and the matrix is enhanced; this enhanced interfacial bonding helps to improve the strength, hardness and wear resistance of the aluminum alloy; in addition, fine nano TiC particles can be better dispersed in the aluminum alloy matrix, so that the dispersion strengthening effect is achieved, and the comprehensive mechanical properties of the aluminum alloy are further improved. In practice, in the present application, the particle size of the nano TiC particles is not smaller, and when the particle size is too small, the nano TiC particles may be distributed in the aluminum alloy to cause agglomeration, which may reduce the performance of the aluminum alloy; and too small particle size may cause difficulty in uniform dispersion of particles during the preparation process, increasing the preparation difficulty. The heat checks mainly occur in the solidification process of the aluminum alloy due to solidification shrinkage and stress concentration. The nano TiC particles have an excessively large particle size, and may form larger hard particles in the aluminum alloy, and the hard particles may become crack sources when stressed, so that the risk of thermal cracking is increased. Fine nano TiC particles can refine grains of the aluminum alloy, reduce stress concentration at grain boundaries and further reduce the tendency of hot cracking; meanwhile, the nano TiC particles can also improve the fluidity of the aluminum alloy, and are beneficial to reducing defects and cracks in the solidification process. Therefore, in the embodiment of the application, the particle size of the adopted nano TiC particles is 30nm-80nm. Preferably, the particle size of the nano TiC particles is 40-60nm. In the embodiment of the application, as the nano TiC particles are added, nucleation in the solidification process of the aluminum alloy can be promoted, dendrite refinement and even disappearance are caused, and the disappearance of secondary dendrites is helpful for reducing microscopic defects and stress concentration in the aluminum alloy, so that the mechanical property of the aluminum alloy is improved; meanwhile, the reduction of secondary dendrites can improve the thermal stability of the aluminum alloy and reduce the risk of thermal cracking. Because secondary dendrites are typically thermally sensitive areas, their disappearance helps reduce crack formation and propagation. Smaller primary dendrite size means more grain boundaries and a more uniform microstructure, which helps to improve the strength, plasticity and toughness of the aluminum alloy, the grain boundaries can absorb and disperse thermal stress when the material is stressed, reduce crack formation and propagation, and effectively reduce the risk of hot cracking if primary dendrites are refined uniformly enough. Therefore, in the present application, in order to further solve the problem of hot cracking of the aluminum alloy while enhancing the mechanical properties of the aluminum alloy. The secondary dendrites in the tissue structure of the nano TiC particle modified 6-series aluminum alloy disclosed by the embodiment of the application disappear.
In the embodiment of the application, the nano TiC particles have extremely high hardness and excellent mechanical properties, can be used as effective strengthening phases, and can be used for improving the overall performance of the aluminum alloy through a dispersion strengthening and interface strengthening mechanism, and the strength, hardness and toughness of the aluminum alloy can be obviously improved by adding a proper amount of nano TiC particles; too high an addition amount may cause agglomeration of nano TiC particles in the aluminum alloy to form large-sized hard particles, which may reduce plasticity and toughness of the aluminum alloy, resulting in reduced performance of the aluminum alloy. Meanwhile, the addition of a proper amount of nano TiC particles can refine the grain structure, improve the solidification behavior of the aluminum alloy and reduce the hot cracking tendency; excessive addition, hard particles in nano TiC particles can become crack sources in the solidification process, and the risk of hot cracking is increased. Therefore, in the application, in order to obtain the aluminum alloy with enhanced performance and solve the problem of heat cracking, the addition amount of the nano TiC particles in the aluminum liquid is controlled to be 0.5-1.0 wt%.
The effect of the grain size of the second phase on the properties of the aluminum alloy is expressed as: when the second phase grains are smaller, meaning that the number of grain boundaries increases, it contributes to the strength and toughness of the reinforcing material; the increase of the second phase particles reduces the density of the aluminum alloy grain boundaries, reduces the number of the grain boundaries, and leads to the increase of the bending degree of the grain boundaries and the range of the distribution area; thus, the increase in the second phase particles results in a decrease in the hardness and strength of the aluminum alloy, while also decreasing the toughness and plasticity thereof. The composition of the second phase determines the physical and chemical properties of the aluminum alloy, so that the overall performance of the aluminum alloy is affected, the Mg 2 Si phase can improve the hardness and strength of the aluminum alloy, the Cu-Al 2 phase can reduce the ductility of the alloy, the composition of the second phase can adjust the thermal physical properties such as the thermal expansion coefficient and the thermal conductivity of the aluminum alloy, and the thermal cracking risk is further reduced. As a further preferred embodiment, the second phase compound according to the embodiments of the present application is Mg 2Si、AlSiMnFe、CuAl2, and the size of Mg 2Si、AlSiMnFe、CuAl2 in the second phase is 1-10. Mu.m.
As a further preferable scheme, the nano TiC particle modified 6-series aluminum alloy provided by the embodiment of the application has the yield strength of 350-370MPa, the tensile strength of 380-420MPa and the elongation after fracture of 8.5-13% in the T6 state.
The embodiment of the application also provides a preparation method of the nano TiC particle modified 6-series aluminum alloy, which selects nano TiC particles, modifies cast aluminum and deformed aluminum through an external process, optimizes and improves microstructure of the aluminum alloy, improves strength and plasticity of the alloy, and inhibits the problem of hot cracking of the deformed aluminum in the casting process. The preparation method comprises the following steps:
remelting aluminum alloy: melting the aluminum alloy at a first preset temperature to obtain aluminum liquid, and controlling the temperature of the aluminum liquid to be kept at a second preset temperature;
adding nano TiC particles: under the second preset temperature condition, adding cosolvent and nano TiC particles into the aluminum liquid in batches, and stirring the melt while adding;
Refining: and after the nano TiC particles are completely added, adding a refining agent for refining in the stirring process, and standing after degassing and slagging-off treatment to obtain the nano TiC particle modified 6-series aluminum alloy.
In the preparation method, the remelting of the aluminum alloy is to obtain uniform aluminum liquid, in the remelting process, the temperature influences the melting and uniformity of the aluminum alloy, if the temperature is too high, the aluminum alloy may be excessively oxidized, so that metal loss and impurities are increased, and if the temperature is too low, the aluminum alloy may not be completely melted, unmelted particles or impurities remain in the aluminum liquid, so that the subsequent addition and dispersion of nano TiC particles are influenced. Moreover, nano TiC particles can be effectively dispersed into the aluminum liquid at a proper temperature to form uniform modified alloy; if the temperature is too high, the nano TiC particles may be agglomerated or oxidized, and the modification effect of the nano TiC particles is lost; and too low a temperature may result in insufficient dispersion of particles, affecting the modifying effect. The remelting temperature also affects the subsequent refining, degassing, slag skimming and other treatment processes; the refining agents have different activities at different temperatures, so that proper temperatures need to be selected to ensure the best refining effect; the effects of degassing and skimming are also affected by temperature, with appropriate temperatures facilitating the evacuation and removal of gases and dross. In addition, the remelting temperature also has an influence on the grain structure and the performance of the aluminum alloy, and the overhigh temperature can cause the growth of grains and influence the mechanical property and the thermal stability of the alloy; while too low a temperature may result in insufficient grain refinement and may also affect the properties of the alloy. Therefore, considering the important influence of the remelting temperature of the aluminum alloy on the subsequent process, strict control is required to ensure that the nano TiC particle modified 6-series aluminum alloy with excellent performance is prepared. In the embodiment of the application, the first preset temperature is controlled to be 800-820 ℃; the second preset temperature is controlled to be 850-900 ℃. Preferably, in some embodiments, the first preset temperature is 805-815 ℃; the second preset temperature is preferably 850-860 ℃.
The nano TiC particles can refine grains, improve microstructure and improve mechanical properties of the alloy. The addition of a small amount of nano TiC particles can obviously improve the yield strength and the tensile strength of the aluminum alloy, and meanwhile, the elongation percentage is kept unchanged basically. However, the nano TiC particles are added into the aluminum liquid to modify the aluminum alloy, so that some problems are unavoidable. Because of the extremely small size and high specific surface area of the nano TiC particles, agglomeration phenomenon is easy to occur, so that uneven dispersion in an aluminum alloy matrix is caused, and the uneven dispersion state can influence the reinforcing effect of the nano TiC particles in the aluminum alloy, so that the performance improvement is limited. In the embodiment of the application, a plurality of schemes are adopted to solve the problem of agglomeration of nano TiC particles in aluminum liquid.
One solution to solve the problem of agglomeration of nano TiC particles in an aluminum liquid is to add a cosolvent simultaneously with the nano TiC particles in the aluminum liquid. The cosolvent can generate one or more low-melting-point compounds through chemical reaction with the metal, and the compounds can obviously reduce the melting point of the whole alloy system in a molten state, improve the fluidity of the metal, facilitate better flow and mixing of nano TiC particles in the aluminum liquid and promote uniform dispersion of the nano TiC particles in the aluminum liquid. In the embodiment of the application, fluorine salt compounds and the like are selected as cosolvent, and one or more than two of potassium fluoroaluminate, potassium fluoride, sodium fluoroaluminate and the like can be selected but not limited to be mixed, and the cosolvent can reduce the contact angle of the nano TiC particles and the aluminum liquid, has good wettability and compatibility in the aluminum liquid, can play a role of heterogeneous nucleating agent, and refines crystal grains of the alloy, thereby further promoting the dispersion of the nano TiC particles. The amount of the cosolvent can influence the dispersion effect of the nano TiC particles in the aluminum liquid and the performance of the aluminum alloy. The proper amount of cosolvent can obviously improve the dispersion effect of nano TiC particles in the aluminum liquid, and the cosolvent can chemically react with aluminum to generate low-melting-point compounds, and the compounds can improve the fluidity of metal in a molten state, so that the uniform dispersion of nano TiC particles is facilitated. Too little co-solvent may not provide sufficient dispersion force, resulting in particle agglomeration; excessive cosolvent may introduce excessive impurities to affect the performance of the aluminum alloy. And the addition of a proper amount of cosolvent can obviously improve the strength, hardness and toughness of the aluminum alloy. Therefore, in the present application, the mass ratio of the added cosolvent to the nano TiC particles is (1-2): 1, preferably, the mass ratio of the cosolvent to the nano TiC particles is (1.2-1.5): 1. in the preferred embodiment, the cosolvent and the nano TiC particles are mixed uniformly and then added into the aluminum liquid in a batch mode, and the cosolvent can be wrapped on the surfaces of the nano TiC particles by mixing the cosolvent and the nano TiC particles in advance, so that interaction force among the particles is effectively reduced, agglomeration is prevented, interfacial tension between the aluminum liquid and the nano TiC particles can be reduced by the cosolvent, and the nano TiC particles are easier to dissolve or disperse in the aluminum liquid.
Another solution to solve the problem of agglomeration of nano TiC particles in aluminum liquid is by adding a small amount of nano Si particles to the nano TiC particles. On one hand, the nano TiC particles and nano Si are mixed, the surface energy of the nano Si particles is higher, and the nano Si particles can be adsorbed on the surfaces of the nano TiC particles, so that the attractive force among the nano TiC particles is reduced, the nano Si particles can play a role similar to a dispersing agent, and the agglomeration phenomenon of the nano TiC particles is effectively reduced; on the other hand, nano Si can drive nano TiC particles to be better dispersed in the aluminum liquid through the good affinity of the nano Si with the aluminum liquid; in addition, nano Si has some active sites in the aluminum liquid, so that more binding points are provided for nano TiC particles, and the affinity of the nano TiC particles with the aluminum liquid is enhanced. In the embodiment of the application, nano TiC particles and nano Si are mixed and then are dispersed uniformly and then added into aluminum liquid in batches, and in the process of mixing nano TiC particles and nano Si, mechanical stirring is adopted to mix the nano TiC particles and nano Si, wherein the stirring speed is 300-500r/min. The proper mixing proportion can ensure that nano TiC particles and nano Si particles are uniformly dispersed in the aluminum liquid, so that the performance of the composite material is improved, and the uniformly dispersed nano particles can obviously refine grains and improve the compactness and mechanical property. In the embodiments of the present application, the inventors found that the ratio of TiC particles to nano Si particles has an important effect on solving the agglomeration problem of nano TiC particles, as well as the refinement of aluminum alloy grains, the mechanical properties and the thermal stability of aluminum alloy materials, and thus, in some embodiments of the present application, the mass ratio of nano TiC particles to nano Si particles is (8-12): 1.
According to the application, the nano TiC particles are added in batches, and each addition is carried out under the stirring condition, so that the agglomeration among the nano TiC particles can be effectively broken, and the uniform dispersion of the nano TiC particles in the aluminum liquid is promoted; and the method can also prevent the temperature from rising or the reaction from being too severe caused by the instant large-scale addition of nano TiC particles, is favorable for keeping the stability of the aluminum liquid and ensures the safety and controllability of the preparation process. In the preparation method of the embodiment of the application, when nano TiC particles are added, the nano TiC particles are added for 3 to 8 times. The stirring speed is a key factor affecting the dispersion uniformity of nano TiC particles in the aluminum liquid, the stirring speed is too low, the particles cannot be fully dispersed, and agglomeration cannot be avoided; too high stirring speed may generate too large shearing force, damage the stability of the aluminum liquid, and even introduce new impurities. In addition, the stirring time also affects the action between the aluminum liquid and the nano TiC particles, the stirring time is too short, and the nano particles may not be completely dispersed or reacted, so that the modification effect is poor; excessive stirring time may increase the preparation cost and may even lead to excessive oxidation or contamination of the aluminum liquid. In order to obtain the best modification effect, in the embodiment of the application, the stirring speed in the stirring process is 120-200r/min, and the stirring time is 2-4 hours after the cosolvent and the nano TiC particles are added.
In addition, in the embodiment of the application, by controlling the addition of nano Si particles into nano TiC particles and controlling the mass ratio of the nano TiC particles to the nano Si particles and combining the addition mode of the nano TiC particles and the control of stirring conditions, the alloy matrix and the second phase compound can be effectively thinned, the dendrite structure of the aluminum alloy is eliminated, the fluidity of the alloy is enhanced, the strength and the toughness of the aluminum alloy material are improved, and the problem of hot cracking is inhibited.
According to the application, the impurity and gas in the aluminum liquid can be further removed by adding the refining agent, so that the purity of the aluminum alloy is improved. The refining process helps to reduce the occurrence of hot cracks and other defects. When the refining agent is selected, the factors such as the components of the aluminum alloy, the impurity removing capability of the refining agent, the influence on nano TiC particles, the use condition and operation requirement, environmental protection and safety, cost and economic benefit and the like are required to be considered. In some embodiments of the application, the amount of refining agent employed is 0.5wt% to 3.0wt% based on the weight of the melt; the refining agent comprises the following components in percentage by mass: caF 2 20wt%-40wt%,MgCl2 KCl 60wt% -80wt%. In the refining agent adopted in the embodiment of the application, caF 2 is mainly used as a degassing agent, and can react with hydrogen in the aluminum liquid to generate hydrogen fluoride gas which is insoluble in the aluminum liquid, so that the hydrogen content in the aluminum liquid is effectively removed. In addition, caF 2 can also react with oxide inclusion in the aluminum liquid to form a compound with smaller density, so that the inclusion can be conveniently floated and removed; when the amount of CaF 2 is in the range of 20wt% to 40wt%, the purity of the aluminum alloy can be obviously improved, and the number of air holes and inclusions is reduced, so that the mechanical property and the processing property of the aluminum alloy are improved. MgCl 2. KCl can form a protective coating layer on the surface of aluminum liquid in the refining process, so that the aluminum liquid is prevented from being contacted with oxygen and water vapor in the air, thereby reducing oxidation and air suction, mgCl 2. KCl can also reduce the melting point of the refining agent, so that the refining agent can be melted and uniformly distributed in the aluminum liquid at a lower temperature, and the refining effect is improved. When the amount of MgCl 2 and KCl is 60-80 wt%, it can ensure that a stable coating layer is formed on the surface of aluminium liquid, effectively prevent oxidation and air suction, and can ensure that the melting point of the refining agent is reduced, and the dispersibility and fluidity of the refining agent are improved.
Degassing is to remove dissolved gases in the aluminum liquid, such as hydrogen, which may cause defects such as hot cracks and holes. In a further preferred embodiment, in the preparation method according to the embodiment of the present application, the degassing mode is a protective gas degassing method or a dynamic vacuum degassing method. Preferably, in some embodiments of the present application, a blanket gas degassing process is employed, and the blanket gas may be selected from nitrogen or an inert gas such as argon, neon, and the like. In the protective gas degassing method, on one hand, the surface of the aluminum liquid needs to be covered by the gas to prevent the external air from entering and reacting with the aluminum liquid; on the other hand, the gas also needs to permeate into the aluminum liquid to help carry out the gas (such as hydrogen) dissolved in the aluminum liquid; the flow of the shielding gas drives the aluminum liquid to roll, which is favorable for uniform distribution and rapid rising of bubbles, so that the flow control of the shielding gas is an important control condition in the degassing process. On one hand, excessive flow of the protective gas can cause excessive rolling of the aluminum liquid, and increase risks of oxidation and inclusion; if the flow is too small, enough bubbles may not be formed, and the degassing effect is affected; on the other hand, the flow of the protective gas determines the size and the number of bubbles, and the too large bubbles can cause too short residence time of the gas in the aluminum liquid, so that the dissolved gas cannot be sufficiently captured; too small bubbles may rise too slowly, affecting the degassing efficiency. Therefore, in the application, in order to avoid the occurrence of these, the flow rate of the shielding gas is controlled to be 0.5-1.0m 3/h during the degassing.
The embodiment of the application also provides application of the nano TiC particle modified 6-series aluminum alloy in manufacturing the mobile phone middle plate. All performance requirements of aluminum alloy for manufacturing mobile phone middle plates are as follows: the yield strength is 350-370MPa, the tensile strength is 390-420MPa, and the elongation after fracture is 8.5% -13%.
The following are specific examples of the present application, which are further defined by the following examples.
Example 1
As shown in fig. 1, this example provides a nano TiC particle modified 6-series aluminum alloy, which is prepared by the following method,
Remelting aluminum alloy: melting aluminum alloy 6013 at 800 ℃ to obtain aluminum liquid, and controlling the temperature of the aluminum liquid to be 850 ℃;
Adding nano TiC particles: adding a pre-mixed mixture of nano TiC particles and potassium fluoroaluminate (the mass ratio of the nano TiC particles to the potassium fluoroaluminate is 1:1.2) into the aluminum liquid for 5 times at the temperature of 850 ℃, wherein the average particle size of the nano TiC particles is 60nm, the adding amount is 0.8wt%, the aluminum liquid is stirred while the stirring speed is 200r/min, and the stirring time is 2 hours after the nano TiC particles are added;
Refining: after the nano TiC particles are completely added, adding a refining agent for refining in the stirring process, wherein the adding amount of the refining agent is 0.2wt%, and then adopting argon as a protective gas for degassing, wherein the flow rate of the protective gas is 0.8m 3/h, and after the refining is completed, removing scum on the surface of a melt and standing for 15min to obtain the nano TiC modified aluminum alloy.
Performance detection
1. The microstructure of the nano TiC modified aluminum alloy obtained in example 1 was examined by a metallographic microscope method: the test results are shown in FIG. 1.
2. The mechanical properties of the nano TiC modified aluminum alloy obtained in the embodiment are detected, and cracks and bubbles in castings processed by the nano TiC modified aluminum alloy are detected. The items tested and the methods/criteria used for testing are shown in Table 1 below.
Table 1: mechanical property detection result of nano TiC modified aluminum alloy
Further, in order to understand the influence of the particle size of the nano TiC particles on the mechanical properties, cracks and bubbles of the modified aluminum alloy material, the aluminum alloy was modified with nano TiC particles having different particle sizes based on the scheme of the above embodiment 1, and other conditions were the same as those of embodiment 1. The experimental conditions and results are shown in Table 2.
Table 2: influence of particle size of nano TiC particles on aluminum alloy performance
The experimental results in table 2 show that the smaller the particle size of nano TiC particles is, the more easy agglomeration is caused, the elongation at break of the aluminum alloy material is reduced due to the agglomeration phenomenon, and in the process of actually modifying the aluminum alloy, coarse phase structures are formed due to the agglomeration, and the phase structures may have adverse effects on the mechanical properties, corrosion resistance and the like of the aluminum alloy; the larger the grain size is, the mechanical property of the aluminum alloy material can be influenced, the mechanical property of the aluminum alloy can be improved by the grain refining effect of the nano TiC particles, and when the grain size is too large, the improvement effect is weakened, so that the mechanical property of the aluminum alloy is reduced. Therefore, according to the comprehensive experimental result, when the particle size of the nano TiC particles is 30-80nm, the performance of the obtained aluminum alloy can meet the application requirement, and the preferred particle size of the nano TiC particles is 40-60nm.
Further, in order to understand the influence of the addition amount of nano TiC particles on the mechanical properties, cracks and bubbles of the modified aluminum alloy material, the aluminum alloy was modified with nano TiC particles having different addition amounts on the basis of the scheme of the above embodiment 1, and other conditions were the same as those of embodiment 1. The experimental conditions and results are shown in Table 3.
Table 3: influence of the addition amount of the nano TiC particles on the performance of the aluminum alloy
When the addition amount of the nano TiC particles is too large, the occurrence of nano clusters can be aggravated at the grain boundary of the composite material, and the clusters can reduce the toughness of the composite material, so that the elongation of the material is reduced. The modified aluminum alloy material provided by the embodiment of the application is mainly used for manufacturing the mobile phone middle plate, and the required elongation is not lower than 8.5%. It can be seen that when the addition amount of nano TiC particles exceeds 1.0%, the elongation at break does not meet the expected requirement.
Further, in order to understand the influence of the stirring speed and the stirring time on the properties, cracks and bubbles of the modified aluminum alloy material, the above-described embodiment of example 1 was followed by using a different aluminum alloy remelting temperature, and the other conditions were the same as in example 1. The experimental conditions and results are shown in Table 4.
Table 4: influence of stirring speed on aluminum alloy performance
The experimental results in table 4 show that when the stirring speed is too low, the elongation after fracture of the aluminum alloy material is reduced due to the unavoidable clustering phenomenon of nano TiC particles. When the stirring speed is higher than a certain speed, gas is involved in the molten aluminum, and bubbles are generated. Therefore, in order to meet the application requirement of the mobile phone middle plate, the stirring speed is selected to be 120-200r/min.
Example 2
As shown in fig. 2, this example provides a nano TiC particle modified 6-series aluminum alloy, which is prepared by the following method,
Remelting aluminum alloy: melting aluminum alloy 6061 at 810 ℃ to obtain aluminum liquid, heating and controlling the temperature of the aluminum liquid to be 860 ℃;
Adding nano TiC particles: at 860 ℃, adding a mixture of nano TiC particles of potassium fluoroaluminate (the mass ratio of the potassium fluoroaluminate to the nano TiC particles is 1.8:1) into the aluminum liquid for 3 times, wherein the average particle size of the nano TiC particles is 50nm, the adding amount is 0.5wt%, stirring the aluminum liquid while adding, the stirring speed is 200r/min, and the stirring time is 2 hours after adding;
Refining: after the nano TiC particles are completely added, adding a refining agent and argon gas for refining in the stirring process, wherein the adding amount of the refining agent is 0.2wt%, the flow rate of the protective gas is 1m 3/h, and after the refining is finished, skimming scum on the surface of a melt and standing for 12min to obtain the nano TiC modified aluminum alloy.
Performance detection
1. The microstructure of the nano TiC modified aluminum alloy obtained in example 2 was examined by a metallographic microscope method: the test results are shown in fig. 2.
2. The mechanical properties of the nano TiC modified aluminum alloy obtained in the examples were examined, and the examination items and the methods/standards used for the examination are shown in table 5 below.
Table 5: mechanical property detection result of nano TiC modified aluminum alloy
Example 3
As shown in fig. 3, this example provides a nano TiC particle modified 6-series aluminum alloy, which is prepared by the following method,
Remelting aluminum alloy: melting aluminum alloy 6210 at 820 ℃ to obtain aluminum liquid, and controlling the temperature of the aluminum liquid to be 870 ℃;
Adding nano TiC particles: adding nano TiC particles (nano TiC particles are added with nano Si particles in a mass ratio of 10:1) into the aluminum liquid for 8 times at 870 ℃, wherein the average particle size of the nano TiC particles is 60nm, the adding amount is 1.0wt%, the aluminum liquid is stirred while the stirring speed is 200r/min, and the stirring time is 2h after the adding;
Refining: after the nano TiC particles are completely added, adding a refining agent and argon gas for refining in the stirring process, wherein the adding amount of the refining agent is 0.2wt%, the flow rate of the argon gas is 0.5m 3/h, and after the refining is finished, removing scum on the surface of a melt and standing for 12min to obtain the nano TiC modified aluminum alloy.
Performance detection
1. The microstructure of the nano TiC modified aluminum alloy obtained in example 3 was examined by a metallographic microscope method: the test results are shown in fig. 3.
2. The mechanical properties of the nano TiC modified aluminum alloy obtained in the examples were examined, and the examination items and the methods/standards used for the examination are shown in table 6 below.
Table 6: mechanical property detection result of nano TiC modified aluminum alloy
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (6)
1. The preparation method of the nano TiC particle modified 6-series aluminum alloy is characterized by comprising the following steps of:
remelting aluminum alloy: melting 6-series aluminum alloy at a first preset temperature to obtain aluminum liquid, and controlling the temperature of the aluminum liquid to be kept at a second preset temperature, wherein the first preset temperature is 800-820 ℃; the second preset temperature is 850-900 ℃;
Adding nano TiC particles: adding nano Si particles into nano TiC particles, uniformly dispersing after mixing, mixing with a cosolvent, adding the obtained mixture into the aluminum liquid for 3-8 times, stirring the aluminum liquid while adding, wherein the stirring speed is 120-200r/min, and the stirring time is 2-4 hours after adding the cosolvent and the nano TiC particles; the addition amount of the nano TiC particles in the aluminum liquid is 0.5-1.0 wt%, the particle size of the nano TiC particles is 30-80 nm, and the mass ratio of the nano TiC particles to the nano Si particles is (8-12): 1, the mass ratio of the cosolvent to the nano TiC particles is (1-2): 1;
Refining: adding a refining agent for refining in the stirring process after the nano TiC particles are completely added, and standing after degassing and slagging-off treatment to obtain TiC nano modified aluminum alloy; the size of alpha-Al crystal grains in the TiC nano modified aluminum alloy is 1-50 mu m, and the sizes of the second-phase compound including Mg 2Si、AlSiMnFe、CuAl2,Mg2Si、AlSiMnFe、CuAl2 are 1-10 mu m.
2. The method according to claim 1, wherein the refining agent is added in an amount of 0.5wt% to 3.0wt% based on the weight of the aluminum liquid; the refining agent comprises the following components in percentage by mass: caF 2 20wt%-40wt%,MgCl2 KCl 60wt% -80wt%.
3. The method according to claim 1, wherein the degassing is a shielding gas degassing method or a dynamic vacuum degassing method.
4. The nano TiC particle modified 6-series aluminum alloy obtained by the preparation method of any one of claims 1 to 3, which is characterized in that nano TiC particles mixed with nano Si particles are added into aluminum liquid after remelting 6-series aluminum to obtain the aluminum alloy, wherein the mass ratio of the nano TiC particles to the nano Si particles is (8-12): 1, a step of; the addition amount of the nano TiC particles in the aluminum liquid is 0.5-1.0 wt%, and the particle size of the nano TiC particles is 30-80 nm; the size of alpha-Al crystal grains in the modified aluminum alloy is 1-50 mu m, and the sizes of second-phase compounds including Mg 2Si、AlSiMnFe、CuAl2,Mg2Si、AlSiMnFe、CuAl2 in the modified aluminum alloy are 1-10 mu m.
5. The nano TiC particle modified 6-series aluminum alloy according to claim 4, wherein the yield strength of the modified aluminum alloy in the T6 state is 350-370MPa, the tensile strength is 380-420MPa, and the elongation after break is 8.5% -13%.
6. Use of the nano TiC particle modified 6-series aluminum alloy according to claim 4 or 5 for manufacturing a mobile phone middle plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410776356.8A CN118360515B (en) | 2024-06-17 | 2024-06-17 | Nano TiC particle modified 6-series aluminum alloy and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410776356.8A CN118360515B (en) | 2024-06-17 | 2024-06-17 | Nano TiC particle modified 6-series aluminum alloy and preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118360515A CN118360515A (en) | 2024-07-19 |
| CN118360515B true CN118360515B (en) | 2024-10-15 |
Family
ID=91884803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410776356.8A Active CN118360515B (en) | 2024-06-17 | 2024-06-17 | Nano TiC particle modified 6-series aluminum alloy and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118360515B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468485A (en) * | 2018-12-27 | 2019-03-15 | 吉林大学 | A kind of preparation method of nanometer of endogenous TiC particle reinforced aluminum alloy plate |
| CN114101610A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Preparation method of particle-reinforced novel 6XXX aluminum alloy plate strip |
| CN114107745A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Preparation method of high-performance wide 6XXX aluminum alloy plate strip |
| CN114107748A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Novel particle-reinforced 6XXX aluminum alloy plate strip and preparation method thereof |
| CN115058619A (en) * | 2022-07-14 | 2022-09-16 | 河南工程学院 | Nano titanium carbide reinforced 2024 aluminum-based composite material and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109136628A (en) * | 2018-10-22 | 2019-01-04 | 吉林大学 | A kind of hot rolling technology of 6xxx aluminium alloy |
-
2024
- 2024-06-17 CN CN202410776356.8A patent/CN118360515B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468485A (en) * | 2018-12-27 | 2019-03-15 | 吉林大学 | A kind of preparation method of nanometer of endogenous TiC particle reinforced aluminum alloy plate |
| CN114101610A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Preparation method of particle-reinforced novel 6XXX aluminum alloy plate strip |
| CN114107745A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Preparation method of high-performance wide 6XXX aluminum alloy plate strip |
| CN114107748A (en) * | 2020-08-26 | 2022-03-01 | 宝山钢铁股份有限公司 | Novel particle-reinforced 6XXX aluminum alloy plate strip and preparation method thereof |
| CN115058619A (en) * | 2022-07-14 | 2022-09-16 | 河南工程学院 | Nano titanium carbide reinforced 2024 aluminum-based composite material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118360515A (en) | 2024-07-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102978449B (en) | Al-Fe-Sb-RE aluminum alloy, and preparation method and power cable thereof | |
| Shi et al. | Effects of Sc addition on the microstructure and mechanical properties of cast Al-3Li-1.5 Cu-0.15 Zr alloy | |
| CN112680615B (en) | Preparation method, heat treatment method and die-casting method of high-strength and high-toughness die-casting aluminum alloy material | |
| Qin et al. | The effect of Sc addition on microstructure and mechanical properties of as-cast Zr-containing Al-Cu alloys | |
| WO2023241681A1 (en) | Aluminum alloy additive, and preparation method therefor and use thereof | |
| CN108998700B (en) | Ultra-light high-modulus high-strength cast aluminum-lithium-based composite material and preparation method thereof | |
| CN114262810A (en) | Preparation method of hypoeutectic die-casting aluminum-silicon alloy material | |
| CN112593110B (en) | Preparation method of nano-carbide reinforced aluminum matrix composite welding wire | |
| CN115852217A (en) | High-strength easily-extruded aluminum alloy and section extrusion method thereof | |
| CN114214534A (en) | Modified aluminum alloy and preparation method thereof | |
| WO2023125264A1 (en) | High-strength aluminum alloy workpiece and preparation method therefor | |
| WO2023125282A1 (en) | High-plasticity composite modified aluminum alloy part and preparation method therefor | |
| JP2743720B2 (en) | Method for producing TiB2 dispersed TiAl-based composite material | |
| Gobalakrishnan et al. | A comparative study on ex-situ & in-situ formed metal matrix composites | |
| CN115786784A (en) | High-strength and high-toughness cast aluminum-silicon-copper-magnesium alloy, and preparation method and application thereof | |
| CN114411031B (en) | Micron titanium particle reinforced magnesium rare earth based composite material | |
| CN113584361B (en) | High-strength corrosion-resistant 7-series aluminum alloy and casting method thereof | |
| CN112522557B (en) | High-strength and high-toughness die-casting aluminum alloy material | |
| CN118360515B (en) | Nano TiC particle modified 6-series aluminum alloy and preparation method and application thereof | |
| CN110983119B (en) | High-strength high-thermal-conductivity die-casting aluminum alloy material and preparation method thereof | |
| CN113444911A (en) | High-strength high-toughness Al-Mg- (Al-Ti-Nb-B) alloy and preparation method thereof | |
| GB2171723A (en) | Producing an alloy containing titanium carbide | |
| CN115418535A (en) | Aluminum alloy material, preparation method and application thereof, and aluminum alloy product | |
| CN110983215A (en) | Heat treatment method of high-strength high-heat-conductivity die-casting aluminum alloy material | |
| CN115125422B (en) | Corrosion-resistant high-strength-toughness Al-Li-Cu-Zr-Er alloy plate and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |