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Nickel manganin gallium high-temperature shape memory alloy and method for making same

A technology of memory alloy and copper gallium, which is applied in the field of alloys and can solve problems such as the impossibility of cold and hot processing of alloys

Inactive Publication Date: 2008-03-05
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] It is precisely because of the high polycrystalline brittleness of the NiMnGa alloy that it is impossible to perform cold and hot processing of the alloy until now. This polycrystalline brittleness has become a bottleneck problem in the development of the alloy.

Method used

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  • Nickel manganin gallium high-temperature shape memory alloy and method for making same

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: prepare Ni 56 mn 21 Cu 4 Ga 19 hot rolled sheet

[0020] Weigh 56% of nickel with a purity of 99.9%, 21% of manganese with a purity of 99.5%, 4% of copper with a purity of 99.9% and 19% of gallium with a purity of 99.99%; put the above nickel, manganese, copper and gallium raw materials into In the non-consumable vacuum electric arc furnace, vacuumize to 5×10 -3 Pa, filled with high-purity argon to 0.7×10 5 Pa, then repeated smelting at 1900°C for 4 times to obtain a NiMnCuGa high temperature shape memory alloy ingot; put the NiMnCuGa high temperature alloy ingot prepared above into a vacuum heat treatment furnace for heat treatment, and the vacuum degree was 5×10 -3 Pa, heat treatment temperature at 900°C for more than 24 hours, then cool with the furnace; hot-roll the above-mentioned heat-treated NiMnCuGa superalloy ingot at 950°C, and slowly hot-roll the alloy ingot into a sheet with a thickness of 0.5mm Alloy material; cut the alloy sheet obtaine...

Embodiment 2

[0022] Embodiment 2: prepare Ni 56 mn 17 Cu 8 Ga 19 hot rolled sheet

[0023] Weigh 56% of nickel with a purity of 99.9%, 17% of manganese with a purity of 99.5%, 8% of copper with a purity of 99.9% and 19% of gallium with a purity of 99.99%; put the above nickel, manganese, copper and gallium raw materials into In the non-consumable vacuum electric arc furnace, vacuumize to 6×10 -3 Pa, filled with high-purity argon to 0.5×10 5Pa, and then repeated smelting at 2000°C for 5 times to obtain a NiMnCuGa high-temperature shape memory alloy ingot; the above-mentioned NiMnCuGa high-temperature shape memory alloy ingot was put into a vacuum heat treatment furnace for heat treatment, and the vacuum degree was 5×10 -3 Pa, after heat treatment at 850°C for 24 hours, then cool in the furnace; hot-roll the above-mentioned heat-treated NiMnCuGa superalloy ingot at 850°C, and slowly hot-roll the alloy ingot into a sheet with a thickness of 0.8mm Alloy material; the alloy sheet obtained...

Embodiment 3

[0025] Embodiment 3: prepare Ni 50 mn 17 Cu 8 Ga 25 hot rolled sheet

[0026] Weigh 50% of nickel with a purity of 99.9%, 17% of manganese with a purity of 99.5%, 8% of copper with a purity of 99.9% and 25% of gallium with a purity of 99.99%; put the above nickel, manganese, copper and gallium raw materials into In the non-consumable vacuum electric arc furnace, vacuumize to 5×10 -3 Pa, filled with high-purity argon to 0.6×10 5 Pa, then repeated smelting at 1800°C for 5 times to obtain a NiMnCuGa high temperature shape memory alloy ingot; put the NiMnCuGa high temperature alloy ingot prepared above into a vacuum heat treatment furnace for heat treatment, and the vacuum degree was 4×10 -3 Pa, heat treatment temperature at 850°C for 72 hours, and cool with the furnace; cut the alloy sheet obtained above into small pieces by wire cutting method, put it in the heat treatment furnace, keep it at 850°C for 30min, and then quickly ice water Quenching is to obtain the sample for...

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Abstract

The present invention provides one kind of high temperature shape memory Ni-Mn-Cu-Ga alloy with high martensitic transformation temperature and high plasticity and its preparation process. The shape memory Ni-Mn-Cu-Ga alloy consists of Ni 50-57 at.%, Mn 17-25 at.%, Cu 1-8 at.% and Ga 17-25 at.%. It is prepared with Ni, Mn, Cu and Ga through vacuumizing and argon protected smelting in a furnace to obtain alloy ingot, heat treatment at 850-900 deg.c and cooling inside the furnace, hot rolling at 850-950 deg.c into alloy sheet, wire electrode cutting into required shape, heat treatment and final quenching in ice water to obtain high temperature shape memory Ni-Mn-Cu-Ga alloy.

Description

technical field [0001] The invention relates to an alloy, in particular to a nickel-manganese-copper-gallium (NiMnCuGa) high-temperature shape memory alloy material and a preparation method thereof. Background technique [0002] The relatively mature NiTi, CuZnAl and Fe-based shape memory alloys that have been developed so far have low martensitic transformation temperatures (<120°C), but in engineering fields such as nuclear power, aerospace, automobiles, and chemicals, all require Shape memory alloys can operate at higher temperatures (>200°C). Therefore, research on high-temperature shape memory alloys with a martensitic transformation temperature exceeding 200°C has attracted more and more attention in recent years (1, Wang Yongqian, Zhao Liancheng, Research Progress of High Temperature Shape Memory Alloys, Functional Materials, 1995, 26(4), 377; 2. Peng Hongying, Wei Zhongguo, Yang Dazhi, Research Progress of High Temperature Shape Memory Alloys, Materials Science...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05C22C1/02C22F1/10
Inventor 马云庆杨水源刘兴军王翠萍张锦彬黄艺雄
Owner XIAMEN UNIV
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