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A kind of high-entropy alloy reinforced and toughened by multi-element doping and its preparation method

A high-entropy alloy and multi-element technology, which is applied in the field of multi-element doping enhanced and toughened high-entropy alloys and their preparation, to achieve the effects of increasing atomic size difference δ, avoiding difficult processing and analysis, and improving strength and toughness

Active Publication Date: 2022-03-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a high-entropy alloy reinforced and toughened by multi-element doping and its preparation method, which overcomes the shortcomings of single-element doping, so as to achieve the purpose of simultaneously improving strength and toughness

Method used

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  • A kind of high-entropy alloy reinforced and toughened by multi-element doping and its preparation method
  • A kind of high-entropy alloy reinforced and toughened by multi-element doping and its preparation method
  • A kind of high-entropy alloy reinforced and toughened by multi-element doping and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Step 1: Use SiC sandpaper to remove the oxide layer on the surface of Al, Co, Cr, Fe, Ni, Ti and Zr metal raw materials with a purity of not less than 99.99%, then place it in an ultrasonic cleaner and clean it with alcohol, take it out and air dry it naturally;

[0052] Step 2: Calculate according to the atomic ratio Al:Co:Cr:Fe:Ni:Ti:Zr=20:20:20:20:20:5:1 and weigh the pure metal with a total mass of (30±0.1)g raw material;

[0053] Step 3: Put the raw materials into the copper crucible of the vacuum arc melting furnace in order of the metal melting point from low to high, and the vacuum degree is at least 2.5×10 -3 Pass high-purity argon gas under the environment of Pa;

[0054] Step 4: First smelt pure titanium to absorb the residual oxygen in the furnace cavity; then smelt the alloy, keep the arc for 20-30 seconds, and carry out electromagnetic stirring at the same time, turn it over after the alloy cools down, repeat this more than 4 times , to get AlCoCrFeNiTi ...

Embodiment 2

[0057] Step 1: Use SiC sandpaper to remove the oxide layer on the surface of Al, Co, Cr, Fe, Ni, Hf and Zr metal raw materials with a purity of not less than 99.99%, then place it in an ultrasonic cleaner and clean it with alcohol, take it out and air dry it naturally;

[0058] Step 2: Calculate according to the atomic ratio Al:Co:Cr:Fe:Ni:Hf:Zr=100:100:100:100:100:5:1 and weigh the pure metal with a total mass of (30±0.1)g raw material;

[0059] Step 3: Put the raw materials into the copper crucible of the vacuum arc melting furnace in order of the metal melting point from low to high, and the vacuum degree is at least 2.5×10 -3 Pass high-purity argon gas under the environment of Pa;

[0060] Step 4: First smelt pure titanium to absorb the residual oxygen in the furnace cavity; then smelt the alloy, keep the arc for 20-30 seconds, and carry out electromagnetic stirring at the same time, turn it over after the alloy cools down, repeat this more than 4 times , to get AlCoCrFe...

Embodiment 3

[0063] Step 1: Use SiC sandpaper to remove the oxide layer on the surface of Al, Co, Cr, Fe, Ni, Ti and Hf metal raw materials with a purity of not less than 99.99%, then place it in an ultrasonic cleaner and clean it with alcohol, take it out and air dry it naturally;

[0064] Step 2: Calculate according to the atomic ratio Al:Co:Cr:Fe:Ni:Ti:Hf=20:20:20:20:20:4:1 and weigh the pure metal with a total mass of (30±0.1)g raw material;

[0065] Step 3: Put the raw materials into the copper crucible of the vacuum arc melting furnace in order of the metal melting point from low to high, and the vacuum degree is at least 2.5×10 -3 Pass high-purity argon gas under the environment of Pa;

[0066] Step 4: First smelt pure titanium to absorb the residual oxygen in the furnace cavity; then smelt the alloy, keep the arc for 20-30 seconds, and carry out electromagnetic stirring at the same time, turn it over after the alloy cools down, repeat this more than 4 times , to get AlCoCrFeNiTi ...

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Abstract

The invention belongs to the field of high-entropy alloys, and in particular relates to a high-entropy alloy reinforced and toughened by multi-element doping and a preparation method thereof. The high-entropy alloy composition includes Al, Co, Cr, Fe, Ni, and M, and the atomic percentages of each element are: Al is 16%-22%, Co is 16%-22%, and Cr is 16%-22%. , Fe is 16%-22%, Ni is 16%-22%, M is 1%-8%; the Ω of the high-entropy alloy is 1.1-1.5, and the δ is 6.2-6.8; the M element is selected from Zr , Ti, Hf at least 2 kinds. The preparation method is as follows: put the high-purity metal in a vacuum electric arc melting furnace, and repeatedly smelt it for more than four times under the protection of an inert atmosphere. The invention uses the concept of multi-element doping, so that the strength and toughness of the high-entropy alloy of the system are significantly improved, and the density is also reduced, thereby increasing the specific strength of the alloy.

Description

technical field [0001] The invention belongs to the field of high-entropy alloys, and in particular relates to a high-entropy alloy reinforced and toughened by multi-element doping and a preparation method thereof. Background technique [0002] Researchers have been developing high-strength, high-toughness materials. High-entropy alloys are promising materials with multiple major elements and simple solid-solution structures, often composed in equiatomic or near-equatomic ratios. The compositional design of high-entropy alloys and the interaction of various elements have always been the core issues in the field of high-entropy alloys. [0003] In previous studies, AlCoCrFeNi high-entropy alloys have been widely studied due to their excellent compressive strength and plastic strain. Appropriate addition of Ti, V, Mo, Nb, Zr and other elements can achieve solid solution strengthening and precipitation strengthening of the AlCoCrFeNi matrix alloy, resulting in some excellent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C30/00C22C1/02
Inventor 刘文胜李松廖羽扬黄兰萍
Owner CENT SOUTH UNIV
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