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Ni-Fe-Mn-Al alloy material and preparation method thereof

A technology of ni-fe-mn-al and alloy materials, which is applied in the field of Ni-Fe-Mn-Al alloy magnetic refrigeration materials and its preparation, can solve the problems of no magnetocaloric effect, low magnetization, and limited applications, and achieve The effects of non-toxic thermal conductivity, good performance stability, good mechanical properties and molding performance

Inactive Publication Date: 2014-08-13
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two phases before and after the martensitic transformation of Ni-Mn-Al alloys are both weak magnetic states, resulting in a very small change in magnetization (ΔM) before and after the phase transformation, and basically no magnetocaloric effect, which limits the use of this type of alloy as a magnetic refrigeration material. Applications

Method used

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  • Ni-Fe-Mn-Al alloy material and preparation method thereof
  • Ni-Fe-Mn-Al alloy material and preparation method thereof
  • Ni-Fe-Mn-Al alloy material and preparation method thereof

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Embodiment 1

[0027] The preparation composition of this embodiment is Ni 44 Fe 6 mn 32 al 18 The subscripts of each element represent the atomic number percentage content of the corresponding element in the alloy. Specifically include the following steps:

[0028] (1) Press Ni 44 Fe 6 mn 32 al 18 Chemical formula ingredients, respectively weighing Ni, Fe, Mn, Al metal raw materials with a purity of 99.9%; the atomic percentages are: Ni is 44%, Fe is 6%, Mn is 32%, and Al is 18%;

[0029] (2) Put the weighed raw materials into a water-cooled crucible, and draw a vacuum to 1×10 -3 When the Pa is below, argon gas is introduced to generate an arc, the melting current is 200A, each sample is turned over 3 times, and a total of 4 times of melting is used to ensure uniform composition;

[0030](3) The smelted ingot sample was sealed in a vacuum quartz tube, annealed at 1100 ° C for 72 hours, and then quenched in cold water to achieve a highly ordered arrangement of atoms to obtain Ni 44...

Embodiment 2

[0035] Preparation composition is Ni 42 Fe 8 mn 32 Al 18 Alloy Blocks:

[0036] (1) Press Ni 42 Fe 8 mn 32 Al 18 Chemical formula ingredients, respectively weighing Ni, Fe, Mn, Al metal raw materials with a purity of 99.9%; the atomic percentages are: Ni is 42%, Fe is 8%, Mn is 32%, and Al is 18%;

[0037] (2) Put the weighed raw materials into a water-cooled crucible, and draw a vacuum to 1×10 -3 When the Pa is below, argon gas is introduced to generate an arc, the melting current is 300A, each sample is turned over 3 times, and a total of 4 times of melting is used to ensure uniform composition;

[0038] (3) Seal the smelted ingot sample in a vacuum quartz tube, anneal at 1150°C for 72 hours, then put the quartz tube into cold water for quenching to achieve a highly ordered arrangement of atoms, and obtain a magnetic alloy polycrystalline ingot ;

[0039] (4) The prepared polycrystalline samples were cut into smaller sizes by wire electric discharge cutting, and va...

Embodiment 3

[0041] Preparation composition is Ni 46 Fe 4 mn 32 Al 18 Alloy bulk material: except that the composition of the sample is Ni 46 Fe 4 mn 32 Al 18 , the atomic percentages are respectively: 46% for Ni, 4% for Fe, 32% for Mn, and 18% for Al; The martensitic transformation temperature and magnetic entropy change values ​​of the samples are shown in Table 1.

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Abstract

The invention provides a Ni-Fe-Mn-Al alloy material, which has a chemical formula of Ni<50-x>Fe<x>Mn<50-y>Al<y> (2=<x=<9, 16<=y<=18). The preparation comprises the following steps: (1) weighting pure elements according to the ratio of the chemical formula, mixing the pure elements together; (2) placing the mixed material in a water-cooling copper crucible, and repeatedly smelting the mixed material through a conventional electric arch smelting method so as to obtain a uniform alloy casting ingot. The obtained polycrystalline casting ingot can be made into Ni<50-x>Fe<x>Mn<50-y>Al<y> rapidly-quenched strips with a certain texture through a melt quick quenching method. Compared to that of the conventional Ni-Mn base ferromagnetic shape-memory alloy, the binding strength among the crystals of the Ni-Fe-Mn-Al alloy is higher, and thus the mechanical property of the Ni-Fe-Mn-Al alloy is better. The Ni-Fe-Mn-Al alloy is prepared through a conventional method, the raw materials are cheap, and furthermore, the Ni-Fe-Mn-Al alloy has a strong magneto-thermal effect under a low magnetic field, so the Ni-Fe-Mn-Al alloy can be applied to the magnetic refrigeration field.

Description

technical field [0001] The invention relates to a magnetic alloy material, in particular to a Ni-Fe-Mn-Al alloy magnetic refrigeration material and a preparation method thereof. Background technique [0002] In contemporary society, refrigeration technology has penetrated into almost every field of production technology and scientific research, and is playing an increasingly important role in improving the quality of human life. Magnetic refrigeration is a unique refrigeration technology that uses magnetic materials as working fluids. Its basic principle is to use the magnetocaloric effect of magnetic refrigeration materials to achieve the purpose of refrigeration. Magnetic refrigeration technology is a new type of green refrigeration technology, which has obvious advantages compared with traditional gas compression refrigeration. First of all, there is no environmental pollution. Since the working medium is a solid material and water can be used as a heat transfer medium i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/03C22C30/00C09K5/02B22D11/06
Inventor 轩海成康利涛陈锋华韩培德王敦辉都有为
Owner TAIYUAN UNIV OF TECH
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