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Rare earth magnetic material with high magnetocrystalline anisotropy and large magnetic strain and preparation method thereof

A magnetic material and anisotropic technology, applied in the field of rare earth magnetic materials with high magnetocrystalline anisotropy and large magneto-induced strain and their preparation, can solve the problem of inability to achieve breakthroughs in martensitic transformation temperature and magnetocrystalline anisotropy, Martensitic transformation temperature drops, affects the use range of alloys, etc., to achieve the effects of large magnetic strain, high martensitic transformation point, and large magnetic crystal anisotropy

Active Publication Date: 2015-10-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of its own properties, the traditional magnetic shape memory alloy cannot make a breakthrough in the martensitic transformation temperature and magnetocrystalline anisotropy, which has seriously limited its industrial promotion.
In order to improve the magnetocrystalline anisotropy of magnetically controlled shape memory alloys, some scholars have proposed alloying to increase the degree of anisotropy, but while the magnetocrystalline anisotropy of the alloy is increased, the martensitic transformation temperature has also dropped significantly, which seriously affects The scope of use of the alloy

Method used

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  • Rare earth magnetic material with high magnetocrystalline anisotropy and large magnetic strain and preparation method thereof
  • Rare earth magnetic material with high magnetocrystalline anisotropy and large magnetic strain and preparation method thereof
  • Rare earth magnetic material with high magnetocrystalline anisotropy and large magnetic strain and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The composition of the preparation is Co 42 Ni 32 Al 25.5 Er 0.5 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:

[0023] (1) Weigh respectively Co, Ni, Al, Er with a purity of 99.9%;

[0024] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -3 b. The melting temperature is 1300°C; c. The melting process uses magnetic stirring; d. The melting time is 0.5 hours.

[0025] (3) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 550 ℃; time: 100 hours; vacuum degree: 1×10 -2 MPa. Then cool down to room temperature with the furnace.

[0026] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.

Embodiment 2

[0028] The composition of the preparation is Co 41 Ni 30 Al 23 Er 6 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:

[0029] (1) Weigh respectively Co, Ni, Al, Er with a purity of 99.9%;

[0030] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -4 b. The melting temperature is 1400°C; c. The melting process uses magnetic stirring; d. The melting time is 1.5 hours.

[0031] (3) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 800°C; time: 70 hours; vacuum degree: 5×10 -3 MPa. Then cool down to room temperature with the furnace.

[0032] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.

Embodiment 3

[0034] The composition of the preparation is Co 28 Ni 30 Al 32 Er 10 A magnetic alloy with magnetic field-driven twin martensitic deformation, the preparation method of which is as follows:

[0035] (1) Weigh respectively Co, Ni, Al, Er with a purity of 99.9%;

[0036] (2) Put the weighed raw materials in the crucible, and use vacuum melting. The melting conditions are: a.1×10 -5 b. The melting temperature is 1500°C; c. The melting process uses magnetic stirring; d. The melting time is 2 hours.

[0037](3) Carry out vacuum annealing treatment to the above-mentioned smelted alloy ingot, the treatment conditions are: temperature 1000 ℃; time: 24 hours; vacuum degree: 1×10 -3 MPa. Then cool down to room temperature with the furnace.

[0038] The polycrystalline sample prepared by the above method was cut into 5×5×8 mm samples by wire cutting to detect various characteristic curves.

[0039]

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Abstract

The invention provides a rare-earth magnetic material with high magnetocrystalline anisotropy and large magnetoelastic strain and a preparation method thereof. The material has high magnetocrystalline anisotropy, and can provide large magnetocrystalline anisotropy under the action of an external magnetic field, so that the material is subjected to twin crystal rearrangement under the martensite state, so as to generate large magnetoelastic strain. The chemical formula of the alloy is CoxNiyAlzErj, wherein x is smaller than or equal to 42 and greater than or equal to 28; y is smaller than or equal to 32 and greater than or equal to 25; z is smaller than or equal to 35 and greater than or equal to 23; j is smaller than or equal to 10 and greater than or equal to 0.5; x+y+z+j is 100; x, y, z and j represent the mole percentage content. Compared with the existing alloy, the high-temperature magnetic shape memory alloy CoxNiyAlzErj disclosed by the invention has high magnetocrystalline anisotropy, high magnetoelastic strain and good mechanical property, and has important application in the fields of an actuator, a magnetosensitive element and a miniature electromechanical system.

Description

technical field [0001] The invention belongs to the field of magnetically controlled shape memory alloys, and relates to a rare earth magnetic material with high magnetic crystal anisotropy and large magnetic induced strain and a preparation method. Background technique [0002] Magnetically controlled shape memory alloys can not only obtain deformation through the reorientation of martensitic twins induced by stress and temperature, but also obtain deformation through the reorientation of martensitic twins induced by an external magnetic field. Normally, when the alloy is cooled from high temperature to below the martensitic transformation temperature, the internal structure of the alloy will undergo thermoelastic martensitic transformation, and the magnetic moments of the generated martensitic twin variants will be in the lowest energy mode. Arrange randomly. At this time, when a certain external magnetic field is applied to the alloy, the direction of the magnetic moment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02C22F1/00H01F1/053
Inventor 薛烽巨佳周健白晶孙扬善厉虹
Owner SOUTHEAST UNIV
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