CN106834834A - A kind of use for electronic products high-strength aluminum alloy and preparation method thereof - Google Patents
A kind of use for electronic products high-strength aluminum alloy and preparation method thereof Download PDFInfo
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- CN106834834A CN106834834A CN201710108987.2A CN201710108987A CN106834834A CN 106834834 A CN106834834 A CN 106834834A CN 201710108987 A CN201710108987 A CN 201710108987A CN 106834834 A CN106834834 A CN 106834834A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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- 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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- 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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/053—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with zinc as the next major constituent
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Abstract
A kind of use for electronic products high-strength aluminum alloy and preparation method thereof, the composition and mass percent of the use for electronic products high-strength aluminum alloy constitute and are：Zn 6.0~6.5%, Mg 1.0~1.2%, Li 0.2~0.4%, Zr 0.01~0.015%, C 0.002~0.003%, Re 0.01~0.03%, Fe≤0.1%, balance of Al and inevitable impurity, impurity is single≤0.05%, total amount≤0.15%.Use for electronic products high-strength aluminum alloy of the present invention has that intensity is high, plasticity is good, heat-tinting function admirable the characteristics of, it is suitable for manufacturing the shell of the portable type electronic products such as big screen intelligent mobile phone, panel computer, notebook computer, with wide market application foreground.
Description
Technical field
The invention belongs to technical field of aluminum alloy technology, a kind of use for electronic products high-strength aluminum alloy and its preparation are specifically related to
Method.
Background technology
With the portable type electronic product such as smart mobile phone, panel computer, notebook computer screen enlarging and lightening development,
It is badly in need of the aluminum alloy casing of high intensity to improve resistance to compression, the bending resistance of fuselage, it is existing to avoid fuselage from bending, bending etc. occur
As.7000 line aluminium alloys belong to heat-treatable strengthened high-strength aluminum alloy, are currently used primarily in aerospace field, such as manufacture
Wallboard, bulkhead, spar, undercarriage of aircraft etc., therefore, 7000 line aluminium alloys are also called aerolite.7000 line aluminium alloys
Main alloy element be Zn and Mg, Zn and Mg can be formed in addition to solution strengthening effect, also reinforcing effect it is extremely notable
MgZn2Mutually strengthen the intensity of aluminium alloy.With the increase of Zn, Mg content, the intensity of 7000 line aluminium alloys is also improved therewith, but
With the rising of intensity, the plasticity of alloy begins to decline, and heat-tinting performance is also deteriorated therewith, and becoming occurs in the color after oxidation
It is grey, dimmed and lose metallic luster.7000 line aluminium alloys commonly used at present, such as 7005,7050,7075, though there is intensity high
Feature, but its plasticity and heat-tinting performance are universal all poor, it is impossible to and satisfaction takes high-decoration of the formula electronic product to appearance member
It is required that.
The content of the invention
Above-mentioned there is problem and shortage it is an object of the invention to be directed to, there is provided a kind of intensity is high, plasticity is good, heat-tinting
Use for electronic products high-strength aluminum alloy of function admirable and preparation method thereof.
The technical proposal of the invention is realized in this way：
Use for electronic products high-strength aluminum alloy of the present invention, is characterized in being made up of following component and mass percent：Zn
6.0~6.5%, Mg 1.0~1.2%, Li 0.2~0.4%, Zr 0.01~0.015%, C 0.002~0.003%, Re 0.01~
0.03%, Fe≤0.1%, balance of Al and inevitable impurity, impurity is single≤0.05%, total amount≤0.15%, wherein described
Re into being grouped into and mass percent is：Pr 11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.
Preferably, use for electronic products high-strength aluminum alloy of the present invention, is made up of following component and mass percent：
Zn 6.3%, Mg 1.1%, Li 0.3%, Zr 0.015%, C 0.003%, Re 0.02%, Fe≤0.1%, balance of Al and can not
The impurity for avoiding, impurity is single≤0.05%, total amount≤0.15%, wherein the Re into being grouped into and mass percent is：Pr
11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.
The preparation method of use for electronic products high-strength aluminum alloy of the present invention, is characterized in comprising the following steps：
The first step：From Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity more than or equal to 99.9% aluminium ingot,
Zinc ingot metal, magnesium ingot are used as raw material；
Second step：By aluminium ingot in 740~780 DEG C of heating fusings, and add account for zinc ingot metal that raw material gross weight is 6.0~6.5%,
1.0~1.2% magnesium ingot and 1~2% Al20Li alloys, stirring are fused into aluminum alloy melt；
3rd step：After to aluminum alloy melt refining degasification slagging-off, the Al5Zr1C for accounting for that raw material gross weight is 0.2~0.3% is added
Alloy and 0.01~0.03% mischmetal Re, the composition that stirring enables aluminum alloy to liquid are uniform；
4th step：Aluminum alloy melt is cooled to 700~720 DEG C and 0.5~1 hour is stood, aluminium alloy is then cast as；
5th step：By aluminium alloy in 490~500 DEG C of solution treatment 1~3 hour, after water quenching, in 120~130 DEG C of Ageing Treatments 15
~18 hours, use for electronic products high-strength aluminum alloy is obtained after furnace cooling.
The present invention compared with prior art, with advantages below：
The room temperature tensile intensity of use for electronic products high-strength aluminum alloy of the present invention is more than 420MPa, and yield strength is more than 380MPa,
Elongation is more than 15%, and oxide thickness is uniform and bright in color, with intensity it is high, plasticity is good, heat-tinting function admirable spy
Point, is suitable for manufacturing the shell of the portable type electronic products such as big screen intelligent mobile phone, panel computer, notebook computer, with wide
Wealthy market application foreground.
Specific embodiment
To make the purpose of the present invention, technical scheme and effect clearer, clear and definite, make further detailed to the present invention below
Describe in detail bright.
Use for electronic products high-strength aluminum alloy of the present invention, is made up of following component and mass percent：Zn 6.0
~6.5%, Mg 1.0~1.2%, Li 0.2~0.4%, Zr 0.01~0.015%, C 0.002~0.003%, Re 0.01~
0.03%, Fe≤0.1%, balance of Al and inevitable impurity, impurity is single≤0.05%, total amount≤0.15%.
Preferably, the composition of the use for electronic products high-strength aluminum alloy and mass percent composition are：Zn 6.3%, Mg
1.1%, Li 0.3%, Zr 0.015%, C 0.003%, Re 0.02%, Fe≤0.1%, balance of Al and inevitable impurity,
Impurity is single≤0.05%, total amount≤0.15%.
The Re into being grouped into and mass percent is：Pr 11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd
24.5%。
Wherein, Zn and Mg are the main alloy elements of use for electronic products high-strength aluminum alloy of the present invention, except with solid solution
Outside invigoration effect, the two can also form the extremely significant MgZn of reinforcing effect2Phase, is the primary strengthening phase of aluminium alloy.With Zn,
The increase of Mg contents, the intensity of aluminium alloy is also improved therewith, but the moulding and heat-tinting performance of alloy can also decline therewith.For
Ensure that aluminium alloy has enough intensity, good plasticity and heat-tinting performance, therefore, the selection of Zn contents 6.0~
6.5%, Mg content are selected 1.0~1.2%, it is preferred that Zn contents are that 6.3%, Mg contents are 1.1%.
Li is most light metallic element, and Li is added in use for electronic products high-strength aluminum alloy, and aluminium conjunction can be reduced first
The density of gold, improves the specific strength and specific stiffness of aluminium alloy, reaches light-weighted effect.Next to that Li is in aluminium alloy ag(e)ing process
The Al of nano-scale can also be separated out3Li and Al2MgLi hardening constituents, these hardening constituents can pinning dislocation, subgrain and crystal boundary, raising aluminium
The intensity and plastic deformation ability of alloy, the Li of addition 0.2~0.4% can produce significant effect to aluminium alloy, it is preferred that
Li additions are 0.3%.
Zr, C are that Al5Zr1C alloys are by potassium fluorozirconate and carbon dust in being added to aluminium alloy in the form of Al5Zr1C alloys
The reaction of mixture and aluminium liquid obtain, substantial amounts of ZrC particles are contained in inside.Al5Zr1C alloys are that a kind of new aluminium alloy is brilliant
Grain fining agent, inventor experimental results demonstrate the existing Al5Ti1B and Al5Ti1C alloys of Al5Zr1C alloy ratios have stronger
Grain refining capability, addition 0.2~0.3% Al5Zr1C alloys, 0.01~0.015% Zr and 0.002 is contained in aluminium alloy
~0.003% C, can notable refining aluminum alloy crystal grain, improve the structural homogenity of aluminium alloy, the plasticity for improving aluminium alloy becomes
Shape ability, it is preferred that Al5Zr1C alloy addition levels are 0.3%, and the C of 0.015% Zr and 0.003% is contained in aluminium alloy.
Re is to contain Pr, Nd, Pm, Sm, Gd totally 5 kinds of mischmetals of LREE, the physical chemistry of LREE
Property is active, can be with impurity element reaction generation high-melting-point, the high stable such as the hydrogen in aluminum alloy melt, oxygen, iron, silicon, manganese, copper, chromium
Property rare earth compound, there is deep purifying to act on aluminum alloy melt, impurity element can be eliminated to intensity of aluminum alloy and aoxidizing
The adverse effect of color performance, increases thickness, uniformity and the brightness of oxidation film layer.The lot of experiments of inventor shows,
Containing Pr, Nd, Pm, Sm, Gd, totally 5 kinds of effects of the mixed light rare earth of LREE are a kind of than addition or a few is light for addition
The effect of rare earth element is all more preferable, therefore, the mixed light rare earth of selection addition 0.01~0.03%, it is preferred that mixed light rare earth adds
Dosage is 0.02%.
Present invention also offers the preparation method of the use for electronic products high-strength aluminum alloy, following steps are specifically included：
The first step：From Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity more than or equal to 99.9% aluminium ingot,
Zinc ingot metal, magnesium ingot are used as raw material；
Second step：By aluminium ingot in 740~780 DEG C of heating fusings, and add account for zinc ingot metal that raw material gross weight is 6.0~6.5%,
1.0~1.2% magnesium ingot and 1~2% Al20Li alloys, stirring are fused into aluminum alloy melt；
3rd step：After to aluminum alloy melt refining degasification slagging-off, the Al5Zr1C for accounting for that raw material gross weight is 0.2~0.3% is added
Alloy and 0.01~0.03% mischmetal Re, the composition that stirring enables aluminum alloy to liquid are uniform；
4th step：Aluminum alloy melt is cooled to 700~720 DEG C and 0.5~1 hour is stood, aluminium alloy is then cast as；
5th step：By aluminium alloy in 490~500 DEG C of solution treatment 1~3 hour, after water quenching, in 120~130 DEG C of Ageing Treatments 15
~18 hours, use for electronic products high-strength aluminum alloy is obtained after furnace cooling.
Preparation method of the invention, from high-purity aluminium ingot, zinc ingot metal, magnesium ingot, Al20Li alloys, Al5Zr1C alloys and mixing
Used as raw material, by optimizing the content of Zn, Mg main alloying element, addition Al20Li alloys carry out V-N steel to rare earth Re,
After refined degasification, slagging-off, Al5Zr1C alloys and mischmetal are added, Al5Zr1C alloys can be given full play to and mixing is dilute
Crystal grain refinement and deep purifying effect of the soil to aluminum alloy melt, it is ensured that use for electronic products high-strength aluminum alloy of the present invention obtains high-strength
Degree, high-ductility and excellent heat-tinting performance.
In order to more describe use for electronic products high-strength aluminum alloy of the present invention and preparation method in detail, several realities are exemplified below
Example is applied to be further described.
Embodiment 1：
Use for electronic products high-strength aluminum alloy of the present invention, is made up of following component and mass percent：Zn 6.0%, Mg
1.0%, Li 0.2%, Zr 0.01%, C 0.002%, Re 0.01%, Fe≤0.1%, balance of Al and inevitable impurity, it is miscellaneous
Matter is single≤0.05%, total amount≤0.15%, wherein the Re into being grouped into and mass percent is：Pr 11.7%, Nd
24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.Preparation method is comprised the steps of：
The first step：99.9% aluminium ingot, zinc ingot metal, magnesium are equal to from Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity
Ingot is used as raw material；
Second step：By aluminium ingot in 740 DEG C of heating fusings, and add account for zinc ingot metal, 1% magnesium ingot that raw material gross weight is 6.0% and
1% Al20Li alloys, stirring is fused into aluminum alloy melt；
3rd step：After degasification slagging-off is refined to aluminum alloy melt with carbon trichloride, it is 0.2% to add and account for raw material gross weight
Al5Zr1C alloys and 0.01% mischmetal Re, the composition that stirring enables aluminum alloy to liquid are uniform；
4th step：Aluminum alloy melt is cooled to 700 DEG C and 1 hour is stood, aluminium alloy is then cast as；
5th step：By aluminium alloy in 500 DEG C of solution treatment 1 hour, after water quenching, in 120 DEG C of Ageing Treatments 18 hours, furnace cooling
After obtain use for electronic products high-strength aluminum alloy.
Embodiment 2：
Use for electronic products high-strength aluminum alloy of the present invention, is made up of following component and mass percent：Zn 6.3%, Mg
1.1%, Li 0.3%, Zr 0.015%, C 0.003%, Re 0.02%, Fe≤0.1%, balance of Al and inevitable impurity,
Impurity is single≤0.05%, total amount≤0.15%, wherein the Re into being grouped into and mass percent is：Pr 11.7%, Nd
24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.Preparation method is comprised the steps of：
The first step：From Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity be equal to 99.95% aluminium ingot, zinc ingot metal,
Magnesium ingot is used as raw material；
Second step：By aluminium ingot in 760 DEG C of heating fusings, and addition accounts for the zinc ingot metal, 1.1% magnesium ingot that raw material gross weight is 6.3%
Al20Li alloys with 1.5%, stirring is fused into aluminum alloy melt；
3rd step：After degasification slagging-off is refined to aluminum alloy melt with carbon trichloride, it is 0.3% to add and account for raw material gross weight
Al5Zr1C alloys and 0.02% mischmetal Re, the composition that stirring enables aluminum alloy to liquid are uniform；
4th step：Aluminum alloy melt is cooled to 710 DEG C and 0.7 hour is stood, aluminium alloy is then cast as；
5th step：By aluminium alloy in 495 DEG C of solution treatment 2 hours, after water quenching, in 125 DEG C of Ageing Treatments 16 hours, furnace cooling
After obtain use for electronic products high-strength aluminum alloy.
Embodiment 3：
Use for electronic products high-strength aluminum alloy of the present invention, is made up of following component and mass percent：Zn 6.5%, Mg
1.2%, Li 0.4%, Zr 0.015%, C 0.003%, Re 0.03%, Fe≤0.1%, balance of Al and inevitable impurity,
Impurity is single≤0.05%, total amount≤0.15%, wherein the Re into being grouped into and mass percent is：Pr 11.7%, Nd
24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.Preparation method is comprised the steps of：
The first step：From Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity be equal to 99.99% aluminium ingot, zinc ingot metal,
Magnesium ingot is used as raw material；
Second step：By aluminium ingot in 780 DEG C of heating fusings, and addition accounts for the zinc ingot metal, 1.2% magnesium ingot that raw material gross weight is 6.5%
Al20Li alloys with 2%, stirring is fused into aluminum alloy melt；
3rd step：After degasification slagging-off is refined to aluminum alloy melt with carbon trichloride, it is 0.3% to add and account for raw material gross weight
Al5Zr1C alloys and 0.03% mischmetal Re, the composition that stirring enables aluminum alloy to liquid are uniform；
4th step：Aluminum alloy melt is cooled to 720 DEG C and 0.5 hour is stood, aluminium alloy is then cast as；
5th step：By aluminium alloy in 490 DEG C of solution treatment 3 hours, after water quenching, in 130 DEG C of Ageing Treatments 15 hours, furnace cooling
After obtain use for electronic products high-strength aluminum alloy.
By National Standard of the People's Republic of China GB/T16865-2013, by the use for electronic products high intensity of embodiment 1-3
Aluminium alloy is processed into standard tensile specimen, and room temperature tensile is carried out on DNS200 type electronic tensile test machines, and rate of extension is 2 millis
M/min, tensile mechanical properties are as shown in table 1.By the use for electronic products high-strength aluminum alloy of embodiment 1-3 sulfuric acid 80g/L,
Anodic oxidation is carried out under the conditions of citric acid 9g/L, lactic acid 7g/L, current density 1.5A/dm2, voltage 10V, oxidization time 30min
Treatment, as a result as shown in table 1.
The tensile mechanical properties and oxidation susceptibility of the embodiment 1-3 use for electronic products high-strength aluminum alloys of table 1
| Embodiment sequence number | Tensile strength/MPa | Yield strength/MPa | Elongation/% | Oxide-film situation |
| Embodiment 1 | 420.4 | 382.8 | 17.1 | Uniformly, light |
| Embodiment 2 | 447.1 | 401.3 | 16.5 | Uniformly, light |
| Embodiment 3 | 461.4 | 425.4 | 15.7 | Uniformly, light |
From the testing result of table 1, the room temperature tensile intensity of use for electronic products high-strength aluminum alloy of the present invention is more than 420MPa,
Yield strength is more than 380MPa, and elongation is more than 15%, and anodic oxidation thickness is uniform and bright in color, with intensity is high, plasticity
Well, the characteristics of heat-tinting function admirable, it is suitable for manufacture big screen intelligent mobile phone, panel computer, notebook computer etc. portable
The shell of formula electronic product, with wide market application foreground.
The present invention is described by embodiment, but is not limited the invention, with reference to description of the invention, institute
Other changes of disclosed embodiment, such as the professional person for this area is readily apparent that, such change should belong to
Within the scope of the claims in the present invention are limited.
Claims (3)
1. a kind of use for electronic products high-strength aluminum alloy, it is characterised in that be made up of following component and mass percent：Zn 6.0
~6.5%, Mg 1.0~1.2%, Li 0.2~0.4%, Zr 0.01~0.015%, C 0.002~0.003%, Re 0.01~
0.03%, Fe≤0.1%, balance of Al and inevitable impurity, impurity is single≤0.05%, total amount≤0.15%, wherein described
Re into being grouped into and mass percent is：Pr 11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.
2. use for electronic products high-strength aluminum alloy according to claim 1, it is characterised in that by following component and quality hundred
Divide than composition：Zn 6.3%, Mg 1.1%, Li 0.3%, Zr 0.015%, C 0.003%, Re 0.02%, Fe≤0.1%, surplus
Be Al and inevitable impurity, impurity is single≤0.05%, total amount≤0.15%, wherein the Re into being grouped into and quality hundred
Point ratio is：Pr 11.7%, Nd 24.2%, Pm 21.7%, Sm 17.9%, Gd 24.5%.
3. a kind of method for preparing the use for electronic products high-strength aluminum alloy as described in above-mentioned any claim, it is characterised in that bag
Include following steps：
The first step：From Al20Li alloys, Al5Zr1C alloys, mischmetal Re and purity more than or equal to 99.9% aluminium ingot,
Zinc ingot metal, magnesium ingot are used as raw material；
Second step：By aluminium ingot in 740~780 DEG C of heating fusings, and add account for zinc ingot metal that raw material gross weight is 6.0~6.5%,
1.0~1.2% magnesium ingot and 1~2% Al20Li alloys, stirring are fused into aluminum alloy melt；
3rd step：After to aluminum alloy melt refining degasification slagging-off, the Al5Zr1C for accounting for that raw material gross weight is 0.2~0.3% is added
Alloy and 0.01~0.03% mischmetal Re, the composition that stirring enables aluminum alloy to liquid are uniform；
4th step：Aluminum alloy melt is cooled to 700~720 DEG C and 0.5~1 hour is stood, aluminium alloy is then cast as；
5th step：By aluminium alloy in 490~500 DEG C of solution treatment 1~3 hour, after water quenching, in 120~130 DEG C of Ageing Treatments 15
~18 hours, use for electronic products high-strength aluminum alloy is obtained after furnace cooling.
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Cited By (5)
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| CN107447141A (en) * | 2017-08-10 | 2017-12-08 | 广东和胜工业铝材股份有限公司 | A kind of electronic product casing high-strength aluminum alloy and preparation method thereof |
| CN108048714A (en) * | 2017-12-27 | 2018-05-18 | 柳州智臻智能机械有限公司 | A kind of electronic product structural component aluminium alloy and preparation method thereof |
| CN108425041A (en) * | 2018-06-13 | 2018-08-21 | 合肥仁德电子科技有限公司 | A kind of aluminum alloy casing of electronic product |
| CN108642348A (en) * | 2018-06-05 | 2018-10-12 | 湖南东方钪业股份有限公司 | A kind of Al-Zn-Mg line aluminium alloys proximate matter and preparation method thereof |
| CN112481512A (en) * | 2020-10-20 | 2021-03-12 | 保定隆达铝业有限公司 | Method for treating yellowing of aluminum alloy ingot surface |
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