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High-temperature magnetic shape memory alloy and preparation method thereof

A memory alloy and magnetic technology, applied in the field of shape memory alloy, can solve the problems of restricted application and low martensitic transformation temperature

Inactive Publication Date: 2010-05-12
DALIAN UNIV
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  • Claims
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Problems solved by technology

However, due to its low martensitic transformation temperature, its application is seriously restricted.

Method used

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  • High-temperature magnetic shape memory alloy and preparation method thereof
  • High-temperature magnetic shape memory alloy and preparation method thereof

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Embodiment Construction

[0015] Take 50 parts of Ga, 25 parts of Mn, and 25 parts of Ni according to the molar ratio, put them into a vacuum non-consumable electrode arc furnace, and under the protection of inert gas, arc melting at 1550-1650°C for 10-15 Minutes, then wash the smelted metal block with acetone, and then put it in a vacuum of 10 -1 The quartz tube of Pa is kept at 923K for 60 hours, and then quenched into water; the high-temperature magnetic shape memory alloy Ga is obtained. 2 MnNi.

[0016] The vacuum non-consumable electrode electric arc furnace of this embodiment was purchased from Shenyang Science and Technology Instrument Co., Ltd.

[0017] The inert gas is helium, argon, neon or xenon.

[0018] The Ga prepared as above 2 The heating DSC curve 1 of MnNi alloy was measured under the condition of heating rate of 10K / min, and the cooling DSC curve 2 was measured under the condition of cooling rate of 10K / min. The results are as follows figure 1 shown. It can be seen from the DSC...

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Abstract

The invention relates to a high-temperature magnetic shape memory alloy and a preparation method thereof. The memory alloy contains chemical components in ratios of mole fraction as follows: 50 parts of Ga, 25 parts of Mn and 25 parts of Ni; martensite phase transformation temperature is 780K, and Curie temperature is 340K. The preparation method comprises the following steps: taking and putting 50 parts of Ga, 25 parts of Mn and 25 parts of Ni according to mole fraction into a vacuum nonconsumable electrode arc furnace, conducting arc melting for 10 to 15 minutes at the temperature of 1500 to 1700 DEG C under the protection of inert gas, and then using acetone to wash a smelted metal block; subsequently, putting the metal block in a quartz tube with vacuum degree of 10 to 1Pa to conduct heat preservation for 60 hours at the temperature of 650 DEG C, and then conducting hardening, thus obtaining the high-temperature magnetic shape memory alloy Ga2MnNi. Compared with the existing alloy Ni2MnGa, martensite phase transformation temperature of the high-temperature magnetic shape memory alloy is higher by 220K, and Curie temperature thereof is the same.

Description

technical field [0001] The invention relates to a shape memory alloy, in particular to a high temperature magnetic shape memory alloy and a preparation method thereof. Background technique [0002] Ferromagnetic shape memory alloys (such as Ni 2 MnGa) generally has strong ferromagnetism, large magnetically induced strain, temperature control and magnetic control shape memory effect. However, due to its low martensitic transformation temperature, its application is seriously restricted. Contents of the invention [0003] In view of the above-mentioned problems existing in the prior art, the present invention aims to provide a new material of memory alloy and its preparation method, which has a higher martensitic transformation temperature, and will open up a new path for the application and expansion of materials. the way. [0004] Technical solution of the present invention is realized like this: [0005] A high temperature magnetic shape memory alloy, characterized in...

Claims

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Application Information

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IPC IPC(8): C22C28/00C22C1/02C22F1/16
Inventor 曹江坤董桂馥
Owner DALIAN UNIV
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