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Magnetic shape memory alloy and preparation method thereof

A memory alloy and magnetic technology, applied in the field of magnetic shape memory alloy and its preparation, can solve the problems of low Curie temperature, high brittleness, and high threshold value of magnetic field-driven phase transition

Inactive Publication Date: 2012-10-10
DALIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Ni-Mn-In alloy system still has defects such as high brittleness, high threshold value of magnetic field-driven phase transition, and low Curie temperature, which limit its practical application to a certain extent.

Method used

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  • Magnetic shape memory alloy and preparation method thereof
  • Magnetic shape memory alloy and preparation method thereof

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Embodiment 1

[0021] Weigh 45.4 parts of Ni, 41.5 parts of Mn, 11.1 parts of In and 2 parts of Gd according to atomic percentages and put them into the vacuum non-consumable electrode electric arc furnace. The order of placement from top to bottom is Ni, In, Gd, Mn; arc melting for 20 minutes under the protection of argon and 100A melting current, suck and cast into a rod-shaped sample of Φ10mm×75mm in the device at the bottom of the water-cooled copper crucible, and then mechanically polish the alloy rod body with acetone. Then put the vacuum to 10 -2 In the Pa quartz tube, keep it at 900℃ for 12h, and then quench it into water; that is to obtain high temperature and high plasticity Ni 45.4 Mn 41.5 In 11.1 Gd 2 Magnetic shape memory alloy.

[0022] The high temperature and high plasticity Ni prepared in this embodiment 45.4 Mn 41.5 In 11.1 Gd 2 Alloy and Ni 45.4 Mn 41.4 In 13.1 Gd 0.1 The heating DSC curve of the alloy was measured under the condition of a heating rate of 10K / min, and the cool...

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Abstract

The invention relates to a magnetic shape memory alloy which comprises, in atomic percent, 45.4 parts of Ni, 41.5 parts of Mn, 11.1 parts of In and 2 parts of Gd. The breaking strength of the alloy is 2201MPa, and the martensite phase transition starting temperature of the alloy is 557 DEG C. The breaking strength of the prepared alloy, which is 2201MPa, is about 1820Mpa higher than that of an existing alloy comprising 45.4 parts of Ni, 41.4 parts of Mn, 13.1 parts of In and 0.1 part of Gd; the martensite phase transition starting temperature of the alloy, which is 557 DEG C, is about 200 DEG C higher than that of the existing alloy comprising 45.4 parts of Ni, 41.4 parts of Mn, 13.1 parts of In and 0.1 part of Gd, and the phase transition lag of the alloy is about 150 DEG C; and the breaking strain of the alloy is improved by 200% as compared with that of the existing alloy comprising 45.4 parts of Ni, 41.4 parts of Mn, 13.1 parts of In and 0.1 part of Gd. The prepared alloy comprising 45.4 parts of Ni, 41.5 parts of Mn, 11.1 parts of In and 2 parts of Gd is high in ductility.

Description

Technical field [0001] The invention relates to a magnetic shape memory alloy and a preparation method thereof, and belongs to the technical field of metal alloy materials. Background technique [0002] The traditional shape memory alloy has become the most promising driving material because of its large reversible strain, and its shape memory effect and pseudo-elasticity have been widely used. In addition to the general characteristics of traditional memory alloys, magnetic shape memory alloys can also output large strains and high response frequencies under the action of an external magnetic field. Currently, the widely studied magnetic drive memory alloys mainly include: Ni-Mn-Ga(Al), Ni-Fe-Ga, Co-Ni-Ga(Al) and new Ni-Mn-In(Sn, Sb) alloys. The Ni-Mn-Ga-based alloy is the earliest discovered and the most widely studied magnetic shape memory alloy. Its magnetically induced strain is derived from the macroscopic strain caused by the martensite twin transformation under the actio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02H01F1/053
Inventor 董桂馥张宏剑孙娜张秀玲
Owner DALIAN UNIV
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