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Cocrfenialcusi high entropy alloy and preparation method thereof

A high-entropy alloying and alloying technology, which is applied in the fields of CoCrFeNiAlCuSi high-entropy alloy and its preparation, high-performance CoCrFeNiAlCuSi high-entropy alloy and its preparation, can solve problems such as difficulty in achieving strength-toughness matching and poor plasticity, and achieve a simple and reliable preparation method. , large plasticity, the effect of broad application prospects

Active Publication Date: 2017-01-04
北京中辰至刚科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the reported high-strength high-entropy alloys have poor plasticity, and the high-entropy alloys with better plasticity have low strength, and it is difficult to achieve a good match between strength and toughness.
For example, AlCoCrFeNb 0.5 The yield strength of Ni high-entropy alloy is as high as 2800MPa, but its fracture strain is less than 10%; while the tensile plasticity of FeCoCrNiMn high-entropy alloy is as high as 60%, and its strength is only 200MPa-500MPa

Method used

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  • Cocrfenialcusi high entropy alloy and preparation method thereof
  • Cocrfenialcusi high entropy alloy and preparation method thereof
  • Cocrfenialcusi high entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A CoCrFeNiAlCuSi high-entropy alloy, wherein the molar ratios of Co:Cr:Fe:Ni:Al:Cu:Si are: 1.0:1.0:1.0:1.0:0.56:0.44:0.2.

[0029] A kind of CoCrFeNiAl described in the present embodiment 0.56 Cu 0.44 Si 0.2 The preparation method of high entropy alloy, concrete steps are as follows:

[0030] (1) Ingredients: Elemental Co, Cr, Fe, Ni, Al, Cu, Si with a purity of more than 99.7wt% are used as raw materials, and the oxide skin on the surface of the raw materials is removed by sandpaper and a grinder, and then the raw materials are ultrasonically treated with absolute ethanol Wash to obtain clean raw materials, and accurately weigh the clean raw materials with a total mass of 60g according to the molar ratio.

[0031] (2) Alloy smelting: Use a high-vacuum non-consumable arc melting furnace to alloy and smelt clean raw materials: vacuumize the furnace cavity to a vacuum degree of 2.5×10 -3 After Pa, high-purity argon gas with a purity of 99.999% is filled as a protectiv...

Embodiment 2

[0035] A CoCrFeNiAlCuSi high-entropy alloy, wherein the molar ratio of Co:Cr:Fe:Ni:Al:Cu:Si is: 1.0:1.0:1.0:1.0:0.8:0.2:0.2.

[0036] A kind of CoCrFeNiAl described in the present embodiment 0.8 Cu 0.2 Si 0.2 The preparation method of high entropy alloy, concrete steps are as follows:

[0037] (1) Ingredients: Elemental Co, Cr, Fe, Ni, Al, Cu, Si with a purity of more than 99.7wt% are used as raw materials, and the oxide skin on the surface of the raw materials is removed by sandpaper and a grinder, and then the raw materials are ultrasonically treated with absolute ethanol Cleaning to obtain clean raw materials, and accurately weigh the clean raw materials with a total mass of 60g according to the molar ratio;

[0038] (2) Alloy smelting: Use a high-vacuum non-consumable arc melting furnace to alloy and smelt clean raw materials: vacuumize the furnace cavity to a vacuum degree of 2.5×10 -3After Pa, high-purity argon gas with a purity of 99.999% is filled as a protective g...

Embodiment 3

[0042] A CoCrFeNiAlCuSi high-entropy alloy, wherein the molar ratio of Co:Cr:Fe:Ni:Al:Cu:Si is: 1.0:1.0:1.0:1.0:0.9:0.1:0.2.

[0043] A kind of CoCrFeNiAl described in this embodiment 0.9 Cu 0.1 Si 0.2 The preparation method of high entropy alloy, concrete steps are as follows:

[0044] (1) Ingredients: Elemental Co, Cr, Fe, Ni, Al, Cu, Si with a purity of more than 99.7wt% are used as raw materials, and the oxide skin on the surface of the raw materials is removed by sandpaper and a grinder, and then the raw materials are ultrasonically treated with absolute ethanol Cleaning to obtain clean raw materials, and accurately weigh the clean raw materials with a total mass of 60g according to the molar ratio;

[0045] (2) Alloy smelting: Use a high-vacuum non-consumable arc melting furnace to alloy and smelt clean raw materials: vacuumize the furnace cavity to a vacuum degree of 2.5×10 -3 After Pa, high-purity argon with a purity of 99.999% is filled as a protective gas. Before...

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Abstract

The invention relates to a CoCrFeNiAlCuSi high-entropy alloy and a preparation method thereof, belonging to the technical fields of alloy materials and preparation of the alloy materials. The high-entropy alloy consists of solid solution phases, wherein the molar ratio of Co to Cr to Fe to Ni to Al to Cu to Si is 1.0:1.0:1.0:1.0:(0.56-1.0):(0.1-0.44):0.2 sequentially. The preparation method comprises the following steps: performing alloying smelting on cleaned Co, Cr, Fe, Ni, Al, Cu and Si at a vacuum degree of less than or equal to 2.5*10<-3>Pa under the protection of argon, stirring in a smelting process under the condition that each time of smelting takes more than or equal to 10 minutes to obtain an alloy liquid, cooling the alloy liquid to obtain an alloy ingot, turning over the alloy ingot, and repeatedly smelting for more than or equal to four times to obtain the high-entropy alloy. The high-entropy alloy disclosed by the invention is excellent in comprehensive mechanical performance, has relatively high strength and relatively large plasticity, and has wide application prospects; and the preparation method is simple and reliable.

Description

technical field [0001] The invention relates to a CoCrFeNiAlCuSi high-entropy alloy and a preparation method thereof, in particular to a high-performance CoCrFeNiAlCuSi high-entropy alloy and a preparation method thereof, belonging to the technical field of alloy materials and preparation thereof. Background technique [0002] The high-entropy alloy is composed of at least 5 main elements, and the atomic percentage of each main element is between 5% and 35%, and each minor element is less than 5%. Compared with traditional alloys, high-entropy alloys have higher strength, hardness, wear resistance, corrosion resistance and thermal stability due to their high entropy effect, hysteretic diffusion effect, lattice distortion effect and cocktail effect. The design concept of high-entropy alloys has broken through the limitations of traditional concepts, and has become a new research hotspot in the fields of material science and condensed matter physics. [0003] The current rese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/02C22C1/02
CPCC22C1/02C22C30/02
Inventor 薛云飞李铖王鲁曹堂清马丽莉
Owner 北京中辰至刚科技有限公司