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High-entropy alloy and preparation method thereof

A high-entropy alloy and element technology, applied in the field of high-entropy alloys, can solve the problems of high density and low density, and achieve the effects of excellent compression performance, improved high temperature strength, and good plasticity

Active Publication Date: 2018-10-12
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with conventional superalloys, refractory high-entropy alloys have better resistance to high temperature softening. However, the high density of refractory high-entropy alloy systems (> 10g / cm 3 ), low room temperature ductility and other disadvantages limit their structural applications

Method used

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  • High-entropy alloy and preparation method thereof
  • High-entropy alloy and preparation method thereof
  • High-entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A high entropy alloy of the present invention comprises 19% Cr, 19% Fe, 25% Co, 25% Ni and 12% Ta in atomic percent.

[0030] The preparation method of the high-entropy alloy material of the present embodiment comprises the following steps:

[0031] Use Ta block, Co block, Cr block, Ni block and Fe block with a purity greater than 99.9% as raw materials, according to the ratio of 19% Cr, 19% Fe, 25% Co, 25% Ni and 12% Ta Placed in an electric arc melting furnace, vacuumed to 10 -3 After Pa, Ti ingot is used to further absorb oxygen, and then filled with 0.6 atmospheres of Ar 2 Finally, smelting is carried out. After the first smelting is completed, the obtained ingot is re-melted and smelted again. In this way, arc smelting is carried out 7 times, and the time of each smelting is not less than 5 minutes, so as to obtain a high-entropy alloy with uniform structure.

[0032] The performance test results of the high-entropy alloy high temperature of the present embodimen...

Embodiment 2

[0034] A high entropy alloy of the present invention comprises 19.5% Cr, 19.5% Fe, 25.5% Co, 25.5% Ni and 10% Ta in atomic percent.

[0035] The preparation method of the high-entropy alloy material of the present embodiment comprises the following steps:

[0036] Using Ta block, Co block, Cr block, Ni block and Fe block with a purity greater than 99.9% as raw materials, according to the ratio of 19.5% Cr, 19.5% Fe, 25.5% Co, 25.5% Ni and 10% Ta Placed in an electric arc melting furnace, vacuumed to 10 -3 After Pa, Ti ingot is used to further absorb oxygen, and then filled with 0.6 atmospheres of Ar 2 Then smelting is carried out, and after the first smelting is completed, the obtained ingot is re-melted and smelted again. In this way, arc smelting is carried out 6 times, and the time of each smelting is not less than 5 minutes, so as to obtain a high-entropy alloy with uniform structure.

[0037] The performance test results of the high-entropy alloy high temperature of the...

Embodiment 3

[0040] A high entropy alloy of the present invention comprises 18.5% Cr, 18.5% Fe, 24.5% Co, 24.5% Ni and 8% Ta in atomic percent.

[0041] The preparation method of the high-entropy alloy material of the present embodiment comprises the following steps:

[0042] Use Ta block, Co block, Cr block, Ni block and Fe block with a purity greater than 99.9% as raw materials, according to the ratio of 18.5% Cr, 18.5% Fe, 24.5% Co, 24.5% Ni and 8% Ta Placed in an electric arc melting furnace, vacuumed to 10 -3 After Pa, Ti ingot is used to further absorb oxygen, and then filled with 0.6 atmospheres of Ar 2 After the first smelting, the obtained ingot is re-melted and smelted again. In this way, arc smelting is carried out 5 times, and the time of each smelting is not less than 5 minutes, so as to obtain a high-entropy alloy with uniform structure.

[0043] The performance test results of the high-entropy alloy high temperature of the present embodiment are shown in Table 1; its scann...

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Abstract

The invention discloses a high-entropy alloy. The high-entropy alloy comprises Cr, Fe, Co, Ni and Ta at the non-equal atomic ratio. The invention further discloses a preparation method of the high-entropy alloy. The preparation method comprises the steps of weighing Ta blocks, Co blocks, Cr blocks, Ni blocks and Fe blocks according to the stoichiometric ratio of the alloy elements; then, smeltingthe weighed raw materials in an arc-melting furnace, and obtaining the high-entropy alloy upon completion of smelting. The high-entropy alloy has excellent compression performance at high temperature,and higher plasticity at room temperature as well as excellent comprehensive mechanical properties, and meets the requirement of application to aerospace materials.

Description

technical field [0001] The invention belongs to the field of high-entropy alloys, in particular to a high-entropy alloy and a preparation method thereof. Background technique [0002] In recent years, high-entropy alloys (HEAs) have received extensive attention. However, previous studies have shown that high-entropy alloys with a body-centered cubic crystal structure have good strength, but poor plasticity; high-entropy alloys with a face-centered cubic structure have excellent ductility, but the strength of the material structure cannot meet people's needs . FeCoCrNiMn-based (FCC structure) and refractory high-entropy alloy (BCC structure) represent the two most common types in the current high-entropy alloy system. Due to the many slip systems unique to the FCC structure, its plasticity is better but its strength Lower, on the contrary, the material of BCC structure has lower plasticity but higher strength. [0003] Aerospace materials need to study a high-temperature l...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C30/00
Inventor 刘咏韩六六
Owner CENT SOUTH UNIV
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