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Toughening 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 high brittleness and high driving magnetic field threshold

Inactive Publication Date: 2010-05-12
DALIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of high brittleness and high threshold value of the driving magnetic field in the existing shape memory alloy Ni-Mn-In, the present invention dopes the rare earth element Gd into the alloy, and provides a new type of shape memory alloy and its preparation method

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  • Toughening magnetic shape memory alloy and preparation method thereof
  • Toughening magnetic shape memory alloy and preparation method thereof

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Embodiment Construction

[0018] Take 45.4 parts of Ni, 41.4 parts of Mn, 13.1 parts of In and 0.1 part of Ga according to the molar ratio, put them into a vacuum non-consumable electrode electric arc furnace, under the protection of inert gas, under the condition of 1550-1650 °C Arc smelting for 12 to 14 minutes, then cleaning the smelted metal block with acetone, and then putting it into a vacuum with a degree of 10 -1 The Pa quartz tube was kept at 900°C for 12 hours, and then quenched into water; the toughened magnetic shape memory alloy Ni was obtained. 45.4 mn 41.4 In 13.1 Gd 01 .

[0019] The vacuum non-consumable electrode electric arc furnace of this embodiment was purchased from Shenyang Science and Technology Instrument Co., Ltd.

[0020] The inert gas is helium, argon, neon or xenon.

[0021] The Ni prepared in the above examples 45.4 mn 41.4 In 13.1 Gd 0.1 The heating DSC curve 3 of the alloy was measured at a heating rate of 10K / min, and the cooling DSC curve 4 was measured at a ...

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Abstract

The invention discloses a toughening magnetic shape memory alloy and a preparation method thereof. The preparation method comprises the following steps: putting 45.4 molar parts of Ni, (41.5-x) molar parts of Mn, 13.1 molar parts of In and x molar parts of Gd (x is more than zero and is less than or equal to two) in a vacuum nonconsumable electrode electric arc furnace performing electric arc smelting under the protection of inert gases at the temperature of between 1,500 and 1,700 DEG C for 10 to 15 minutes, and cleaning smelted metal blocks by using acetone; and then putting the metal blocks in a quartz tube of which the vacuum degree is between 10 to 1 Pa for heat preservation for 12 hours at the temperature of 900 DEG C, and performing hardening to obtain the toughening magnetic shape memory alloy Ni45.4 Mn41.5-xIn 13.1 Gdx. The breaking strength of the alloy is between 370 and 380 MPa; and compared with that of the traditional Ni-Mn-In alloy, the breaking strength of the alloy is improved by about 100 MPa; a driving magnetic field threshold is between 3.2 and 3.8 T, and compared with that of the traditional Ni-Mn-In alloy, the driving magnetic field threshold is reduced by 1.8 to 1.2 T; and the toughness of the alloy is improved obviously.

Description

technical field [0001] The invention relates to a shape memory alloy, in particular to a toughened magnetic shape memory alloy and a preparation method thereof. Background technique [0002] Shape memory alloy has become the most promising driving material because of its large reversible strain and response frequency, and its shape memory effect and superelastic behavior have been widely used. In addition to the general characteristics of traditional memory alloys, magnetically driven memory alloys can also output large strain and high response frequency under the action of a magnetic field. The currently widely studied magnetic drive memory alloys include Ni-Mn-Ga(Al), Ni-Fe-Ga, Co-Ni-Ga(Al) ] And the new Ni-Mn-In (Sn, Sb) alloy. The Ni-Mn-Ga alloy system is the earliest and most widely studied magnetically driven shape memory alloy. The magnetically induced strain of this alloy comes from the macroscopic strain generated by the rearrangement of martensitic twin crystal v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C1/02
Inventor 赵玲董桂馥
Owner DALIAN UNIV
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