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Six-element high-entropy alloy with first-order magnetic phase transition and preparation method thereof

A high-entropy alloy and magnetic phase transition technology, applied in the field of high-entropy alloys, can solve the problems that high-entropy alloys cannot achieve a first-order magnetic phase transition, and achieve critical transition temperature reversibility, critical transition temperature, and critical transition temperature. control effect

Inactive Publication Date: 2015-02-18
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a high-entropy alloy with a first-order magnetic phase transition in order to overcome the deficiency in the prior art that the high-entropy alloy cannot realize the first-order magnetic phase transition technology

Method used

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  • Six-element high-entropy alloy with first-order magnetic phase transition and preparation method thereof
  • Six-element high-entropy alloy with first-order magnetic phase transition and preparation method thereof
  • Six-element high-entropy alloy with first-order magnetic phase transition and preparation method thereof

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Embodiment 1

[0034] The composition of the electrolyte is as follows: DMSO, vitamin C (0.02 mol L ?1 ), (C 2 h 5 ) 4 NPF 6 (0.02 mol·L -1 ), GdCl 3 (0.015mol·L ?1 ), FeCl 2 (0.0075 mol L ?1 ), CoCl 2 (0.0075 mol L ?1 ), NiCl 2 (0.0075 mol L ?1 ), MnCl 2 (0.0075 mol L ?1 ) and MgCl 2 (0.015 mol L ?1 ). Using copper as the working electrode, platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, the electrochemical reduction deposition was carried out at 30°C, the deposition time was 1h, and the deposition potential was 2V.

[0035] By the above method, the composition is obtained as Mg 19.09 mn 7.83 Fe 29.09 co 16.93 Ni 17.91 Gd 9.15 alloy. Magnetic studies have shown (results such as Figure 4 shown), when the applied magnetic fields are 20, 40, 60 kOe, the transition temperatures are 210, 110, and 90K, respectively.

Embodiment 2

[0037] The composition of the electrolyte is as follows: DMSO, vitamin C (0.02 mol L ?1 ), (C 2 h 5 ) 4 NPF 6 (0.02 mol·L -1 ), GdCl 3 (0.02 mol·L ?1 ), FeCl 2 (0.01 mol·L ?1 ), CoCl 2 (0.01 mol·L ?1 ), NiCl 2 (0.01 mol·L ?1 ), MnCl 2 (0.01 mol·L ?1 ), MgCl 2 (0.02 mol·L ?1 ). Using copper as the working electrode, platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, the electrochemical reduction deposition was carried out at 30°C, the deposition time was 1h, and the deposition potential was 2V.

[0038] By the above method, the composition is obtained as Mg 12.03 mn 11.46 Fe 30.10 co 25.17 Ni 16.15 Gd 5.09 alloy. The magnetic results show that (such as Figure 5 As shown), the alloy undergoes a magnetic transition at about 60K when the applied magnetic field is 5000 Oe; and when the applied magnetic field is 10000 Oe, its transformation temperature drops to 30K.

Embodiment 3

[0040] The composition of the electrolyte is as follows: DMSO, vitamin C (0.02 mol L ?1 ), (C 2 h 5 ) 4 NPF 6 (0.02 mol·L -1 ), GdCl 3 (0.015 mol L ?1 ), FeCl 2 (0.01 mol·L ?1 ), CoCl 2 (0.01 mol·L ?1 ), NiCl 2 (0.01 mol·L ?1 ), MnCl 2 (0.01 mol·L ?1 ), MgCl 2 (0.015 mol L ?1 ). Using copper as the working electrode, platinum sheet as the counter electrode, and a saturated calomel electrode as the reference electrode, the electrochemical reduction deposition was carried out at 30°C, the deposition time was 1h, and the deposition potential was 2V.

[0041] By the above method, the composition is obtained as Mg 14.86 mn 6.02 Fe 34.74 co 15.66 Ni 22.99 Gd 5.73 alloy. The magnetic results show that (such as Image 6 As shown), the alloy undergoes a magnetic transition at around 85K when the applied magnetic field is 5000 Oe.

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Abstract

The invention relates to the technical field of high-entropy alloys and discloses a six-element high-entropy alloy with a first-order magnetic phase transition and a preparation method thereof. The six-element high-entropy alloy with the first-order magnetic phase transition has a general formula structure of MgaMnbFecCodNieGdf and is obtained by electrochemical reduction deposition, wherein an electrolyte in the electrochemical reduction deposition comprises the following components: dimethyl sulfoxide, tetraethylammonium hexafluorophosphate, vitamin C, GdCl3, FeCl2, CoCl2, NiCl2, MnCl2 and MgCl2. The prepared alloy is an amorphous alloy, the magnetic transition of the prepared alloy is the magnetic transition caused by strong electron correlation without being restrained by the crystal form transformation of a material, and therefore, the high-entropy alloy has the advantages of large temperature range of magnetic phase transition, controllable critical transition temperature and reversibility.

Description

technical field [0001] The invention relates to the technical field of high-entropy alloys, in particular to a six-element high-entropy alloy with a first-order magnetic phase transition and a preparation method thereof. Background technique [0002] A primary magnetic phase change material is a material that can undergo a magnetic phase transition near a certain critical condition under the action of external conditions (such as a magnetic field, temperature or pressure, etc.). The material has a significant magnetocaloric effect and a large change in magnetic strength during the transformation, and has become a research hotspot in the field of magnetism in recent years. The first-order magnetic phase transition is thermodynamically a discontinuous phase transition. Materials with a first-order magnetic phase transition are mainly used in magnetic heating and refrigeration, and their use is equivalent to the refrigerant in the current air conditioner. Since the material w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C25C1/24
Inventor 王成胜卢锡洪李伟李明阳刘鹏童叶翔
Owner SUN YAT SEN UNIV
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