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Method for achieving magnetic-field-induced metamagnetic martensite phase change in MnCoGe-based alloy

A technology of martensitic phase transformation and base alloy, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problem of low sensitivity, achieve low preparation cost, simple and convenient preparation method, and increase instability Effect

Active Publication Date: 2017-09-15
JIANGXI UNIV OF SCI & TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (2) Accompanied by obvious hysteresis;
Therefore, people have come to an almost common conclusion: that is, for MnCoGe-based alloys, magnetic field is not an effective method to induce metamagnetic martensitic transformation, that is, the sensitivity of the martensitic transformation of MnCoGe-based alloys to magnetic field is very low.

Method used

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  • Method for achieving magnetic-field-induced metamagnetic martensite phase change in MnCoGe-based alloy
  • Method for achieving magnetic-field-induced metamagnetic martensite phase change in MnCoGe-based alloy
  • Method for achieving magnetic-field-induced metamagnetic martensite phase change in MnCoGe-based alloy

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Embodiment 1

[0045] The present embodiment has the alloy Mn of magnetic field-induced metamagnetic martensitic transformation 0.98 co 1.02 Ge

[0046] The alloy is designed according to the principle, and the specific chemical formula is Mn 0.98 co 1.02 Ge, according to the stoichiometric ratio, calculate the required mass of Mn, Co, and Ge elements for batching, which needs to be accurate to 0.1 mg, and the purity of the metal elements is above 99.99%. Put the prepared raw materials into the water-cooled copper crucible electric arc furnace, and pump the vacuum to 10 -3 Below Pa, fill with argon gas with a purity of 99.999% at 1 atmospheric pressure for arc melting. During the first smelting, melt the metal with a current of 25A and see the molten metal flowing in the crucible. Turn over the block sample smelted in the first pass, slightly increase the current to 35A, and then smelt it 4 times to obtain MnCoGe base alloy ingot; put part of the MnCoGe-based alloy ingot into a quartz t...

Embodiment 2

[0048] The present embodiment has the alloy Mn of magnetic field-induced metamagnetic martensitic transformation 0.965 co 1.035 Ge, the specific preparation method is the same as the preparation process of Example 1, the only difference is that according to Mn 0.965 co 1.035 The stoichiometric ratio of Ge calculates the mass of the required Mn, Co, and Ge elements for batching.

Embodiment 3

[0050] The present embodiment has the alloy Mn of magnetic field-induced metamagnetic martensitic transformation 0.955 co 1.045 Ge, the specific preparation method is the same as the preparation process of Example 1, the only difference is that according to Mn 0.955 co 1.045 The stoichiometric ratio of Ge calculates the mass of the required Mn, Co, and Ge elements for batching.

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Abstract

The invention discloses a method for achieving magnetic-field-induced metamagnetic martensite phase change in MnCoGe-based alloy. The method specifically comprises the steps that the proportion of Co and Mn is adjusted, alloy components are designed, the concentration e / a of valence electrons of the alloy is increased, the instability of the atomic magnetic moment of Mn is increased, and therefore the sensitivity degree of the magnetic structure phase change to a magnetic field is improved, and the magnetic-field-induced metamagnetic martensite phase change is obtained. The method is simple, convenient, low in energy consumption, low in preparation cost and suitable for industrial production, and the prepared MnCoGe-based alloy has the magnetic-field-induced metamagnetic martensite phase change and excellent magnetic property.

Description

technical field [0001] The invention belongs to the preparation method of MnCoGe-based alloy materials, and in particular relates to designing components by adjusting the ratio of Co / Mn to increase the valence electron concentration e / a of the alloy, increase the instability of the magnetic moment of the Mn atom, and improve the martensitic properties of the alloy. The sensitivity of the bulk phase transformation to the magnetic field is determined, thereby obtaining the magnetic field-induced metamagnetic martensitic phase transformation in MnCoGe-based alloys. Background technique [0002] Magnetic refrigeration technology based on the magnetocaloric effect is known as a new type of refrigeration technology that is most likely to replace today's gas compression instructions. It has the advantages of high efficiency, energy saving, environmental friendliness, and small size. The development and application of magnetic refrigeration, especially the magnetic refrigeration tec...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C30/02C22C30/04C22C1/02C22F1/00H01F1/01
CPCC22C1/02C22C30/00C22C30/02C22C30/04C22F1/00H01F1/015
Inventor 马胜灿葛青刘凯钟震晨
Owner JIANGXI UNIV OF SCI & TECH
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