CN107130141B - A kind of high-ductility, the preparation method of high intensity Ni-Mn-Ga-Hf memorial alloys - Google Patents
A kind of high-ductility, the preparation method of high intensity Ni-Mn-Ga-Hf memorial alloys Download PDFInfo
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- CN107130141B CN107130141B CN201710470472.7A CN201710470472A CN107130141B CN 107130141 B CN107130141 B CN 107130141B CN 201710470472 A CN201710470472 A CN 201710470472A CN 107130141 B CN107130141 B CN 107130141B
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 81
- 239000000956 alloy Substances 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000002844 melting Methods 0.000 claims abstract description 35
- 230000008018 melting Effects 0.000 claims abstract description 35
- 230000006698 induction Effects 0.000 claims abstract description 13
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 238000005498 polishing Methods 0.000 claims abstract description 9
- 239000010453 quartz Substances 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 7
- 239000003708 ampul Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000005457 ice water Substances 0.000 claims abstract description 3
- 238000010791 quenching Methods 0.000 claims abstract description 3
- 230000000171 quenching effect Effects 0.000 claims abstract description 3
- 229910052759 nickel Inorganic materials 0.000 claims abstract 2
- 239000007788 liquid Substances 0.000 claims description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 6
- 229910052756 noble gas Inorganic materials 0.000 claims description 4
- 238000005275 alloying Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims 1
- -1 special Sign is Substances 0.000 claims 1
- 238000013459 approach Methods 0.000 abstract description 2
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- 238000012360 testing method Methods 0.000 description 8
- 238000001000 micrograph Methods 0.000 description 7
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- 229910000734 martensite Inorganic materials 0.000 description 6
- 238000000265 homogenisation Methods 0.000 description 5
- 238000011282 treatment Methods 0.000 description 5
- 230000005291 magnetic effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 3
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- 229910000807 Ga alloy Inorganic materials 0.000 description 2
- 238000003776 cleavage reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 230000003446 memory effect Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
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- 229910000979 O alloy Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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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
- C22C1/023—Alloys based on nickel
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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
- C22F1/002—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
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
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Abstract
The present invention relates to a kind of high-ductility, the preparation methods of high intensity Ni Mn Ga Hf memorial alloys, this method is to take Ni, Mn, Ga, Hf to be put into melting in vacuum intermediate-frequency induction melting furnace according to atomic percent, control 350 500Kw of monitor system, it will obtain sample, cooling, cutting, polishing removal surface impurity, quartz ampoule is enclosed after cleaning, is kept the temperature in 5 hours, then ice water of quenching under conditions of 1000 DEG C and is obtained high temperature high-ductility marmem.High temperature prepared by the present invention, high intensity Ni Mn Ga Nb memorial alloys are Ni54‑xMn25Ga21Hfx(x=0.1,0.2,0.5,1,2) has many advantages, such as that fracture strength is big, good toughness, and this method is easy to operate, the alloy property for preparing is stablized, and new approaches have been expanded in the field for high intensity and high-ductility marmem.
Description
Technical field
The present invention relates to a kind of high-ductility, high intensity Ni-Mn-Ga-Hf memorial alloy preparation methods.
Background technology
Ni-Mn-Ga marmems are a kind of novel intelligent ferromagnetic shape memory materials, have thermo elastic martensite concurrently
Phase transformation and ferromagnetic transition, not only with conventional shape-memory alloy by the shape memory effect of Temperature Field Control, but also can
Shape memory effect is generated under magnetic fields.The response frequency of its magneto-shape-memory effect is answered close to piezoelectric ceramics, output
Become close to traditional temperature control marmem, is a kind of intellectual material of great future in engineering applications.Because of its unique feature
It is set also to be able to extensive use in terms of driver and sensor.
But Ni-Mn-Ga block materials still have the shortcomings of brittleness is big, intensity is low and restoring force is small, it significantly limits
The engineer application of the material and its development.These become the main bottleneck that magnetic driven memory alloy is applied and developed.So how
The intensity of alloy is improved, brittleness is reduced, improves alloy mechanical performance, obtains big magnetic entropy change and giant magnetoresistance effect, it has also become note
Recall the main direction of studying of Alloyapplication and development.
Invention content
Big in order to solve existing Ni-Mn-Ga alloys brittleness, the shortcomings of intensity is low and restoring force is small, we are using in vacuum
Frequency induction melting furnace prepares a kind of novel high intensity Ni54-xMn25Ga21HfxAlloy, fracture strength and breaking strain with
The trend of reduction after first increase, up to 5931MPa is presented in the increase of Hf constituent contents, and highest breaking strain is 20.5%, this
Never Leader is crossed in NiMnGa alloys, this can become a kind of new material that memorial alloy is applied and developed.
The marmem of the present invention is prepared as follows：
(1) 52-54 parts of Ni, 25 parts of Mn, 21 parts Ga and 0.1-2 parts of rare element Hf is taken to be put into very according to atomic percent
In empty medium frequency induction melting furnace, it is sequentially placed raw material in the following order：Hf is placed first, is subsequently placed with Ni, is finally putting into Ga,
Due to the high volatile of Mn elements, due to the high volatile of Mn elements, Mn is placed on standby in material alloying device by when charging in advance
With close side fire door；
(2) before melting, 10 × 10 are evacuated down to-3-3×10-3Pa is re-filled with noble gas to 1-0.2Pa, starts melting, control
Monitor system 350-500Kw.Due to the Principle of Melting of Medium frequency induction itself, the metal liquid after thawing will be in the work of electromagnetic field
It is stirred with lower flowing, Mn is eventually adding after the metal liquid being melted is mixed well, pours into alloy liquid after 3-5min
In bar molds, sample is obtained, waits for that its cooling is taken out；
(3) by sample through wire cutting and mechanical polishing removal surface impurity, it is 10 that vacuum degree is enclosed after cleaning-1The quartz of Pa
Guan Zhong is kept the temperature under conditions of 1000 DEG C in 5 hours, then ice water of quenching；Up to Ni54-xMn25Ga21HfxMarmem.
Further, noble gas is high-purity argon gas in the step (2).
Further, acetone washed samples are used in the step (3).
Further, described vacuumize using equipment is mechanical pump or lobe pump.
Another object of the present invention is claimed the above method and prepares high-ductility, high intensity Ni-Mn-Ga-Hf memorial alloys,
The alloy is Ni54-xMn25Ga21Hfx, wherein x=0.1,0.2,0.5,1,2.
Alloying can significantly change alloy transformation temperature and improve its mechanical performance and physical property.Inventor by
In Ni-Mn-Ga ternary alloy three-partalloys with ion electricity price is higher, radius is smaller, have compared with macroion field strength (ion electricity price and radius it
Than) element Hf doping substitute part Ni members and usually improve alloy mechanical property not and reduces or slightly reduction alloy martensite phase
Phase transition temperature, to provide a kind of novel high intensity Ni-Mn-Ga-Hf memorial alloys.Since Mn element saturated vapour pressures are higher,
Volatile, in existing preparation method, the volatile quantity of Mn is not easy to control, can not in exact alloy Mn content, inventor uses
Hf is placed first, then puts Ni, is subsequently placed into Ga, is finally putting into the feed way of Mn, and solve that component content accurately controls asks
Topic.
Vacuum intermediate-frequency induction melting furnace is that eddy heating for heating is generated in metallic conductor using electromagnetic induction under vacuum
Furnace charge is come the method that carries out melting.Small with melting, pumpdown time and melting cycle are short, controlled convenient for temperature, pressure,
The features such as being easily recycled Volatile Elements and accurate composition control.
The shape memory metal shape memorial alloy Ni that the method for the present invention is prepared54-xMn25Ga21Hfx(x=0.1,0.2,
0.5,1,2) ingredient is different from existing magnetic shape memory alloy Ni-Mn-Ga, and has fracture strength by comparison
Greatly, the advantages that good toughness, and this method is easy to operate, the alloy property of preparation is stablized, and is high intensity and high-ductility shape memory
New approaches have been expanded in the field of alloy.
Description of the drawings
Fig. 1 is the high-ductility of the invention prepared, high intensity Ni54-xMn25Ga21Hfx(x=0.1,0.2,0.5,1,2) alloy
Light micrograph, (a) figure is the light micrograph of the alloy of x=0, and (b) figure is the optical microphotograph of the alloy of x=0.1
Photo, (c) figure is the light micrograph of the alloy of x=0.2, and (d) figure is the light micrograph of the alloy of x=0.5, (e)
Figure is the light micrograph of the alloy of x=1, and (f) figure is the light micrograph of the alloy of x=2；
Fig. 2 is the high-ductility of the invention prepared, high intensity Ni54-xMn25Ga21Hfx(x=0.1,0.2,0.5,1,2) alloy
XRD spectrum；
Fig. 3 is Ni prepared by the present invention54-xMn25Ga21HfxThe room temperature compression stress of (x=0.1,0.2,0.5,1,2) alloy
And strain curve；Wherein curve 1 is the alloy of x=0；Curve 2 is the alloy of x=0.1；Curve 3 is x=0.2 alloys；Curve 4
For the alloy of x=0.5；Curve 5 is the alloy of x=1；Curve 6 is the alloy of x=2；
Fig. 4 is Ni prepared by the present invention54-xMn25Ga21HfxThe fracture apperance of (x=0.1,0.2,0.5,1,2) alloy,
In (a) figure be x=0 alloy fracture microphoto, (b) figure is the fracture microphoto of the alloy of x=0.1, and (c) figure is x
The fracture microphoto of=0.2 alloy, (d) figure is the fracture microphoto of the alloy of x=0.5, and (e) figure is the alloy of x=1
Fracture microphoto, (f) figure is the fracture microphoto of the alloy of x=2.
Specific embodiment
The present invention is described in further detail below by embodiment, but is not limited the scope of the invention.Such as without spy
Different explanation, experimental method of the present invention is conventional method, and experiment equipment used, material, reagent etc. can be chemically
Company buys.Vacuum intermediate-frequency induction melting furnace is purchased from Shanghai Twilight electric furnace Co., Ltd.
Embodiment 1
The Ni of the present embodiment54-xMn25Ga21Hfx(x=0) preparation method of memorial alloy is prepared as follows：It presses
It takes 54 parts of Ni, 25 parts of Mn, 21 parts of Ga to be put into vacuum intermediate-frequency induction melting furnace according to atomic percent, puts successively in the following order
Set raw material：Ni pieces are placed first, and Mn pieces and Ga pieces are then placed on spare in smelting furnace, close side fire door.Before melting, using machine
Tool pump, lobe pump are evacuated down to 6.67 × 10-3Pa is re-filled with high-purity argon gas to 0.2Pa.Start melting, controls monitor system
450Kw.Mn pieces are eventually adding after the metal liquid being melted is mixed well, alloy liquid is poured into bar molds by 3-5min
In, the bar samples of Φ 12mm × 60mm are obtained, wait for that its cooling is taken out.Test material is through wire cutting and mechanical polishing removal surface
Impurity, it is 10 that vacuum degree is enclosed after being cleaned with acetone-1In the quartz ampoule of Pa, 5 hours are kept the temperature under conditions of 1000 DEG C and is carried out
Homogenize processing；Obtain Ni54Mn25Ga21Marmem.
Embodiment 2
The Ni of the present embodiment54-xMn25Ga21Hfx(x=0.1) preparation method of memorial alloy is prepared as follows：
53.9 parts of Ni, 25 parts of Mn, 21 parts Ga and 0.1 part of rare element Hf is taken to be put into vacuum intermediate-frequency induction melting according to atomic percent
In stove, it is sequentially placed raw material in the following order：Rare element Hf is placed first, Ni pieces is subsequently placed with, finally by Mn pieces and Ga
Piece is placed on spare in smelting furnace, close side fire door.Before melting, 6.67 × 10 are evacuated down to using mechanical pump, lobe pump-3Pa, then
High-purity argon gas is filled with to 0.2Pa.Start melting, control monitor system 450Kw.After the metal liquid being melted is mixed well
Mn pieces are eventually adding, 3-5min pours into alloy liquid in bar molds, obtains the bar samples of Φ 12mm × 60mm, waits for that its is cold
But it takes out.For test material through wire cutting and mechanical polishing removal surface impurity, it is 10 that vacuum degree is enclosed after being cleaned with acetone-1Pa's
In quartz ampoule, 5 hours are kept the temperature under conditions of 1000 DEG C and carries out Homogenization Treatments；Obtain Ni53.9Mn25Ga21Hf0.1Shape is remembered
Recall alloy.
Embodiment 3
The Ni of the present embodiment54-xMn25Ga21Hfx(x=0.2) preparation method of memorial alloy is prepared as follows：
53.8 parts of Ni, 25 parts of Mn, 21 parts Ga and 0.2 part of rare element Hf is taken to be put into vacuum intermediate-frequency induction melting according to atomic percent
In stove, it is sequentially placed raw material in the following order：Rare element Hf is placed first, Ni pieces is subsequently placed with, finally by Mn pieces and Ga
Piece is placed on spare in smelting furnace, close side fire door.Before melting, 6.67 × 10 are evacuated down to using mechanical pump, lobe pump-3Pa, then
High-purity argon gas is filled with to 0.2Pa.Start melting, control monitor system 450Kw.After the metal liquid being melted is mixed well
Mn pieces are eventually adding, 3-5min pours into alloy liquid in bar molds, obtains the bar samples of Φ 12mm × 60mm, waits for that its is cold
But it takes out.For test material through wire cutting and mechanical polishing removal surface impurity, it is 10 that vacuum degree is enclosed after being cleaned with acetone-1Pa's
In quartz ampoule, 5 hours are kept the temperature under conditions of 1000 DEG C and carries out Homogenization Treatments；Obtain Ni53.8Mn25Ga21Hf0.2Shape is remembered
Recall alloy.
Embodiment 4
The Ni of the present embodiment54-xMn25Ga21Hfx(x=0.5) preparation method of memorial alloy is prepared as follows：
53.5 parts of Ni, 25 parts of Mn, 21 parts Ga and 0.5 part of rare element Hf is taken to be put into vacuum intermediate-frequency induction melting according to atomic percent
In stove, it is sequentially placed raw material in the following order：Rare element Hf is placed first, Ni pieces is subsequently placed with, finally by Mn pieces and Ga
Piece is placed on spare in smelting furnace, close side fire door.Before melting, 6.67 × 10 are evacuated down to using mechanical pump, lobe pump-3Pa, then
High-purity argon gas is filled with to 0.2Pa.Start melting, control monitor system 450Kw.After the metal liquid being melted is mixed well
Mn pieces are eventually adding, 3-5min pours into alloy liquid in bar molds, obtains the bar samples of Φ 12mm × 60mm, waits for that its is cold
But it takes out.For test material through wire cutting and mechanical polishing removal surface impurity, it is 10 that vacuum degree is enclosed after being cleaned with acetone-1Pa's
In quartz ampoule, 5 hours are kept the temperature under conditions of 1000 DEG C and carries out Homogenization Treatments；Obtain Ni53.5Mn25Ga21Hf0.5Shape is remembered
Recall alloy.
Embodiment 5
The Ni of the present embodiment54-xMn25Ga21Hfx(x=1) preparation method of memorial alloy is prepared as follows：It presses
53 parts of Ni, 25 parts of Mn, 21 parts Ga and 1 part of rare element Hf is taken to be put into vacuum intermediate-frequency induction melting furnace according to atomic percent,
It is sequentially placed raw material in the following order：Rare element Hf is placed first, is subsequently placed with Ni pieces, is finally placed on Mn pieces and Ga pieces
It is spare in smelting furnace, close side fire door.Before melting, 6.67 × 10 are evacuated down to using mechanical pump, lobe pump-3Pa is re-filled with height
Pure argon is to 0.2Pa.Start melting, control monitor system 450Kw.It is last after the metal liquid being melted is mixed well to add
Enter Mn pieces, 3-5min pours into alloy liquid in bar molds, obtains the bar samples of Φ 12mm × 60mm, waits for that its cooling takes
Go out.For test material through wire cutting and mechanical polishing removal surface impurity, it is 10 that vacuum degree is enclosed after being cleaned with acetone-1The quartz of Pa
Guan Zhong keeps the temperature 5 hours under conditions of 1000 DEG C and carries out Homogenization Treatments；Obtain Ni53Mn25Ga21Hf1Marmem.
Embodiment 6
The Ni of the present embodiment54-xMn25Ga21Hfx(x=2) preparation method of memorial alloy is prepared as follows：It presses
52 parts of Ni, 25 parts of Mn, 21 parts Ga and 2 part of rare element Hf is taken to be put into vacuum intermediate-frequency induction melting furnace according to atomic percent,
It is sequentially placed raw material in the following order：Rare element Hf is placed first, is subsequently placed with Ni pieces, is finally placed on Mn pieces and Ga pieces
It is spare in smelting furnace, close side fire door.Before melting, 6.67 × 10 are evacuated down to using mechanical pump, lobe pump-3Pa is re-filled with height
Pure argon is to 0.2Pa.Start melting, control monitor system 450Kw.It is last after the metal liquid being melted is mixed well to add
Enter Mn pieces, 3-5min pours into alloy liquid in bar molds, obtains the bar samples of Φ 12mm × 60mm, waits for that its cooling takes
Go out.For test material through wire cutting and mechanical polishing removal surface impurity, it is 10 that vacuum degree is enclosed after being cleaned with acetone-1The quartz of Pa
Guan Zhong keeps the temperature 5 hours under conditions of 1000 DEG C and carries out Homogenization Treatments；Obtain Ni52Mn25Ga21Hf2Marmem.
Embodiment 7
The present embodiment differs only in electric arc melting 12 minutes under conditions of monitor system is 500Kw with embodiment 2-6.
High-ductility prepared by embodiment 1-6, high intensity Ni54-xMn25Ga21HfxAlloy carries out contextual analysis of organization, Fig. 1
For high-ductility, the light micrograph of high-strength alloy, work as x=0.1 as seen in Figure 1, when 0.2,0.5,1,2, owns
It is morphology of martensite that the group of alloy, which is woven in room temperature, and the institutional framework of alloy does not occur with the increase martensite type of Hf contents
Transformation, is still T-type martensite.Fig. 2 is high-ductility, the XRD spectrum of high-strength alloy, it can be seen that as x=2, alloy occurs big
Richness-Hf the phases of the hexagonal structure of amount are still presented T-type martensitic structure, occur a large amount of second phase in alloy at this time, illustrate this
When Hf elements exceeded its solid solubility limit in the alloy.
By the high-ductility of embodiment preparation, high-strength alloy Ni54-xMn25Ga21HfxCarry out fracture strength and breaking strain
Test, test results are shown in figure 3, the high-ductility of embodiment 2-6 preparations, high-strength alloy Ni54-xMn25Ga21HfxFracture it is strong
Degree is between 3266-5931MPa, as the Long-term change trend of reduction after first increase is presented in the increase of Hf contents, than existing Ni-Mn-
Ga alloys improve about 2700-5400Mpa, and breaking strain ratio Ni-Mn-Ga improves 200-400% times, illustrate that the present invention prepares
Alloy ductility is big.Fig. 4 gives high-ductility, high-strength alloy Ni54-xMn25Ga21HfxFracture apperance, can be seen by Fig. 4
Go out, with the increase of Hf contents, the fracture mode of alloy has brittle fracture to gradually become moulding fracture to arrive quasi-cleavage crack again, when
Typical brittle failure is presented in alloy when x=0, and crackle is disconnected along crystal grain；When x=0.1 and 0.2, cleavage fracture mode is presented in alloy,
Occur a large amount of tearing rib in the alloy, and secondary cracks occurs.Ductile fracture is showed as x=0.5, is existed a large amount of
Dimple；As x=2 in fracture high-visible white precipitated phase.
Claims (5)
1. the preparation method of a kind of high-ductility, high intensity Ni-Mn-Ga-Hf memorial alloys, which is characterized in that include the following steps：
(1) 52-54 parts of Ni, 25 parts of Mn, 21 parts Ga and 0.1-2 parts of rare element Hf is taken to be put into vacuum according to atomic percent
In frequency induction melting furnace, it is sequentially placed raw material in the following order：Hf is placed first, is subsequently placed with Ni, is finally putting into Ga, due to
Mn is placed on spare in material alloying device, close side fire door by the high volatile of Mn elements, when charging in advance；
(2) before melting, 10 × 10 are evacuated down to-3-3×10-3Pa is re-filled with noble gas to 1-0.2Pa, starts melting, control melting
Power 350-500Kw；Mn is eventually adding after metal liquid Ga, Hf, Ni for being melted are mixed well, it will mixing after 3-5min
Alloy liquid afterwards pours into bar molds, obtains sample, waits for that its cooling is taken out；
(3) by sample through wire cutting and mechanical polishing removal surface impurity, it is 10 that vacuum degree is enclosed after cleaning-1The quartz ampoule of Pa
In, it is kept the temperature in 5 hours, then ice water of quenching under conditions of 1000 DEG C；Up to Ni54-xMn25Ga21HfxMarmem.
2. the preparation method of a kind of high-ductility according to claim 1, high intensity Ni-Mn-Ga-Hf memorial alloys, special
Sign is that noble gas is high-purity argon gas in the step (2).
3. the preparation method of a kind of high-ductility according to claim 1, high intensity Ni-Mn-Ga-Hf memorial alloys, special
Sign is, acetone washed samples are used in the step (3).
4. the preparation method of a kind of high-ductility according to claim 1, high intensity Ni-Mn-Ga-Hf memorial alloys, special
Sign is that described vacuumize using equipment can be mechanical pump or lobe pump.
5. a kind of method as described in claim 1 prepares high-ductility, high intensity Ni-Mn-Ga-Hf memorial alloys, which is characterized in that
The memorial alloy is Ni54-xMn25Ga21Hfx, wherein x=0.1,0.2,0.5,1,2.
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| CN101220448B (en) * | 2008-02-03 | 2010-07-28 | 哈尔滨工业大学 | Method for manufacturing toughening magnetic shape memory alloy |
| CN104947052A (en) * | 2015-07-27 | 2015-09-30 | 大连大学 | Method for preparing Ni52Mn24Ga24 alloy film through laser pulse sputtering deposition |
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