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A kind of nimncu medium entropy alloy and preparation method thereof

An entropy alloy and alloy technology, applied in the design and preparation of new NiMnCu medium entropy alloys, can solve the problems of no preparation process and achieve good strength and plasticity

Active Publication Date: 2021-11-30
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of MEAs alloys is mainly through smelting and certain mechanical thermal processing, but there is no definite optimal preparation process for a specific alloy.

Method used

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  • A kind of nimncu medium entropy alloy and preparation method thereof
  • A kind of nimncu medium entropy alloy and preparation method thereof
  • A kind of nimncu medium entropy alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The sum of the atomic ratios of elements in the Ni-Mn-Cu medium entropy alloy is 100, and the atomic ratio is n(Ni):n(Mn):n(Cu)=50:22.5:27.5.

[0024] Ni 50 mn 22.5 Cu 27.5 Alloy preparation method, comprises the following steps:

[0025] Step 1, Ni 50 mn 22.5 Cu 27.5 Preparation of alloy casting:

[0026] (1) Raw material ratio: according to Ni 50 mn 22.5 Cu 27.5 Carry out atomic ratio batching;

[0027] (2) Melting and preparing polycrystalline ingots: the raw materials prepared in step (1) were placed in a water-cooled copper crucible in a high-vacuum arc melting furnace, and the cavity of the arc melting furnace was evacuated to 3×10 -3 Finally, 0.05 MPa of inert protective gas is introduced, and the alloy is repeatedly smelted for 4 to 5 times by high-temperature electric arc and electromagnetic stirring is applied at the same time to ensure the uniformity of the composition of the alloy. Finally, an alloy ingot with uniform composition is obtained;

[...

Embodiment 2

[0039] The sum of the atomic ratios of elements in the Ni-Mn-Cu medium entropy alloy is 100, and the atomic ratio is n(Ni):n(Mn):n(Cu)=50:32.5:17.5.

[0040] Ni 50 mn 32.5 Cu 17.5 Alloy preparation method, comprises the following steps:

[0041] Step 1, Ni 50 mn 32.5 Cu 17.5 Preparation of alloy casting:

[0042] (1) Raw material ratio: according to Ni 50 mn 32.5 Cu 17.5 Carry out atomic ratio batching;

[0043] (2) Melting and preparing polycrystalline ingots: the raw materials prepared in step (1) were placed in a water-cooled copper crucible in a high-vacuum arc melting furnace, and the cavity of the arc melting furnace was evacuated to 3×10 -3 Finally, 0.05 MPa of inert protective gas is introduced, and the alloy is repeatedly smelted for 4 to 5 times by high-temperature electric arc and electromagnetic stirring is applied at the same time to ensure the uniformity of the composition of the alloy. Finally, an alloy ingot with uniform composition is obtained;

[...

Embodiment 3

[0055] The sum of the atomic ratios of the elements in the Ni-Mn-Cu medium entropy alloy is 100, and the atomic ratio is n(Ni):n(Mn):n(Cu)=50:17.5:32.5.

[0056] Ni 50 mn 17.5 Cu 32.5 Alloy preparation method, comprises the following steps:

[0057] Step 1, Ni 50 mn 17.5 Cu 32.5 Preparation of alloy casting:

[0058] (1) Raw material ratio: according to Ni 50 mn 17.5 Cu 32.5 Carry out atomic ratio batching;

[0059] (2) Melting and preparing polycrystalline ingots: the raw materials prepared in step (1) were placed in a water-cooled copper crucible in a high-vacuum arc melting furnace, and the cavity of the arc melting furnace was evacuated to 3×10 -3 Finally, 0.05 MPa of inert protective gas is introduced, and the alloy is repeatedly smelted for 4 to 5 times by high-temperature electric arc and electromagnetic stirring is applied at the same time to ensure the uniformity of the composition of the alloy. Finally, an alloy ingot with uniform composition is obtained; ...

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Abstract

The invention discloses a NiMnCu medium-entropy alloy and a preparation method thereof. A novel NiMnCu medium-entropy alloy system with excellent strength and plasticity is developed by designing a certain element ratio and an experimental process. The alloy is made by the following design process: using a vacuum arc melting furnace to repeatedly melt the alloy with a good composition ratio, and prepare it into a polycrystalline ingot. Spray-cast the alloy block into the Cu mold by using a high-vacuum spray-casting furnace to form a dense alloy; homogenize and anneal at 850-950°C for at least 24h. After annealing, the sample was hot-rolled at 850-950°C for 50%, then cold-rolled for 60%, and finally annealed and recrystallized at 690-700°C for 150-180s. Ni 50 mn 32.5 Cu 17.5 The yield strength of the alloy is 561MPa, the elongation is 33%, and the ultimate tensile strength is 1157MPa. The invention reports a novel medium-entropy alloy system with excellent mechanical properties, which expands the research scope of the medium-entropy alloy.

Description

technical field [0001] The invention belongs to the technical field of medium-entropy alloy materials, and relates to the design and preparation method of a novel NiMnCu medium-entropy alloy. Background technique [0002] In recent years, medium entropy alloys (Medium Entropy Alloys, MEAs), as a new type of metal material, have become a hot research topic in the scientific community at home and abroad. With the deepening of research on MEAs, it is found that MEAs can exhibit excellent mechanical properties at both room temperature and low temperature. The excellent mechanical properties exhibited by MEAs are derived from the abundant deformation mechanisms such as dislocation slip, deformation twinning and phase transformation (Bae J W, Seol J B, Moon J, et al. Exceptional phase-transformation strengthening of ferrous medium entropy alloys at cryogenic temperatures[J].Acta Materialia,2018,161:388-399)(Yoshida S,Ikeuchi T,Bhattacharjee T,et al.Effect of elemental combination...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/03C22F1/10
CPCC22C19/002C22C19/005C22C19/03C22F1/10
Inventor 闫海乐王鲁达黄晓明贾楠赵骧左良
Owner NORTHEASTERN UNIV LIAONING