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Toughening ferromagnetic shape memory alloy and preparation method thereof

A memory alloy and ferromagnetic technology, applied in the field of shape memory alloy, can solve the problems of low strength and high brittleness of Ni-Mn-Ga, and achieve the effect of improving the toughness of the alloy

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

[0004] The invention aims to solve the problems of high brittleness and low strength of the existing ferromagnetic shape memory alloy Ni-Mn-Ga, and provides a toughened ferromagnetic shape memory alloy and a preparation method thereof

Method used

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

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Embodiment Construction

[0018] Take 50 parts of Ni, 30 parts of Mn, 18 parts of Ga and 2 parts of Cu in a vacuum non-consumable electrode arc furnace according to the molar ratio, and arc melting at 1600°C under the protection of inert gas After 13 minutes, clean the smelted metal block with acetone, and then put it into a vacuum with a degree of 10 -1 The Pa quartz tube was kept at 1000°C for 5 hours, and then quenched into water; the toughened magnetic shape memory alloy Ni was obtained. 50 mn 30 Ga 18 Cu 2 .

[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. Others are the same as in the first embodiment.

[0021] The prepared Ni 50 mn 30 Ga 18 Cu 2 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 cooling rate of 10K / min. Compared with the existing Ni ...

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Abstract

The invention relates to a toughening ferromagnetic shape memory alloy and a preparation method thereof. The toughening ferromagnetic shape memory alloy comprises the following chemical components in part by mol: 50 mol parts of Ni, 30 mol parts of Mn, (20-x) mol parts Ga and x mol parts Cu, wherein x is more than zero and is less than or equal to two; and the breaking strength of the alloy is between 800 and 820 MPa, and the magnetic entropy change Smag is -17.2 J / kg K. The preparation method comprises the following process steps: putting the Ni, the Mn, the Ga and the Cu in a vacuum nonconsumable electrode electric arc furnace in the set mol part ratio; under the protection of inert gases, performing electric arc smelting for 10 to 15 minutes at the temperature of between 1,500 and 1,700 DEG C, 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 5 hours at the temperature of 1,000 DEG C, and performing hardening to obtain the alloy. The alloy has the characteristics of high breaking strength, high magnetic entropy change and good toughness.

Description

technical field [0001] The invention relates to a shape memory alloy, in particular to a toughened ferromagnetic shape memory alloy and a preparation method thereof. Background technique [0002] Ni-Mn-Ga ferromagnetic shape memory alloy is a new type of shape memory material, which has both thermoelastic martensitic phase transformation and ferromagnetic transformation. It not only has the shape memory effect of traditional shape memory alloys controlled by temperature field, but also can be used in The shape memory effect is produced under the action of a magnetic field. The response frequency of its magnetically controlled shape memory effect is close to that of piezoelectric ceramics, and its output strain is close to that of temperature-controlled shape memory alloys. It is a new type of functional material with great engineering application prospects. The characteristics of recoverable strain and fast response make it widely used in actuators and sensors. [0003] Ho...

Claims

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Application Information

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IPC IPC(8): C22C19/03C22C1/02C22F1/10
Inventor 曾海楠董桂馥
Owner DALIAN UNIV
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