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A five-element high-entropy alloy with excellent strong-plastic matching and its preparation method

A high-entropy alloy and plasticity technology, applied in the field of high-entropy alloy and its preparation, can solve the problem of poor matching of strength and toughness of high-entropy alloy, and achieve the effects of good fluidity and casting performance, good safety and narrow crystallization range.

Active Publication Date: 2020-07-03
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the poor matching of strength and toughness of most high-entropy alloys, one of the purposes of the present invention is to provide a five-element high-entropy alloy with excellent strength-plasticity matching. This high-entropy alloy has both strength and plastic properties, and overcomes the existing high The problem of poor matching of strength and toughness of entropy alloys, at the same time, the present invention provides a preparation method of high-entropy alloys with excellent strong plasticity, which is simple, safe and stable

Method used

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  • A five-element high-entropy alloy with excellent strong-plastic matching and its preparation method
  • A five-element high-entropy alloy with excellent strong-plastic matching and its preparation method
  • A five-element high-entropy alloy with excellent strong-plastic matching and its preparation method

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Effect test

Embodiment 1

[0035] A dual-phase structure high-entropy alloy with good strong-plastic matching, the chemical formula is Al0.8CoCr0.6Fe0.7Ni1.1, wherein the ratio of each element is mole percentage, abbreviated as Ni1.1.

[0036] Use SiC sandpaper and a grinder to remove impurities and oxides on the surface of Al, Co, Cr, Fe and Ni elemental metal materials with a purity of ≥99.9wt%, then place them in a container and add alcohol solution, and use ultrasonic cleaning twice, and then remove Blow dry to obtain five kinds of raw materials;

[0037]According to Al:Co:Cr:Fe:Ni=0.8:1:0.6:0.7:1.1 precise molar ratio, Al, Co, Cr, Fe and Ni elemental metal raw materials are weighed in total 80g and mixed;

[0038] Put the mixed elemental metal raw materials in a high-vacuum non-consumable arc melting furnace, under the protection of argon, at a vacuum degree of 2.4×10 ﹣3 Carry out alloying smelting under MPa, keep stirring during the smelting process, each smelting time is 10 minutes, obtain alloy...

Embodiment 2

[0040] A eutectic high-entropy alloy with good strong-plastic matching, the chemical formula is Al0.8CoCr0.6Fe0.7Ni1.5, wherein the ratio of each element is mole percentage, abbreviated as Ni1.5.

[0041] Use SiC sandpaper and a grinder to remove impurities and oxides on the surface of Al, Co, Cr, Fe and Ni elemental metal materials with a purity of ≥99.9wt%, then place them in a container and add alcohol solution, and use ultrasonic cleaning twice, and then remove Blow dry to obtain five kinds of raw materials;

[0042] According to Al: Co: Cr: Fe: Ni = 0.8:1:0.6:0.7:1.5 accurate molar ratio, Al, Co, Cr, Fe and Ni elemental metal raw materials are weighed and mixed in total 80g;

[0043] Put the mixed elemental metal raw materials in a high-vacuum non-consumable arc melting furnace, under the protection of argon, at a vacuum degree of 2.4×10 ﹣3 Carry out alloying smelting under MPa, keep stirring during the smelting process, each smelting time is 11min, obtain alloy liquid, ...

Embodiment 3

[0045] A hypoeutectic high-entropy alloy with good strong-plastic matching, the chemical formula is Al0.8CoCr0.6Fe0.7Ni1.8, wherein the ratio of each element is mole percentage, abbreviated as Ni1.8.

[0046] Use SiC sandpaper and a grinder to remove impurities and oxides on the surface of Al, Co, Cr, Fe and Ni elemental metal materials with a purity of ≥99.9wt%, then place them in a container and add alcohol solution, and use ultrasonic cleaning twice, and then remove Blow dry to obtain five kinds of raw materials;

[0047] According to Al:Co:Cr:Fe:Ni=0.8:1:0.6:0.7:1.8 accurate molar ratio weighs Al, Co, Cr, Fe and Ni elemental metal raw materials to add up to 80g and mixes;

[0048] Put the mixed elemental metal raw materials in a high-vacuum non-consumable arc melting furnace, under the protection of argon, at a vacuum degree of 2.3×10 ﹣3 Carry out alloying smelting under MPa, keep stirring during the smelting process, each smelting time is 10min, obtain alloy liquid, cool...

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Abstract

The invention discloses a high-entropy quinary alloy with good high strength and high plasticity matching performance. The chemical formula of the high-entropy quinary alloy is AlaCobCrcFedNie (a-e are molar ratios), wherein 1>=a>=0.5, 1.2>=b>=0.7, 1>=c>=0.4, 1>=d>=0.4, and 2.2>=e>=0.8. Furthermore, a:e is 1:1.2-2.5. Furthermore, a is 0.8, b is 1, c is 0.6, d is 0.7, and e is 1.1-2.0. Furthermore,the chemical formula of the alloy is Al0.8CoCr0.6Fe0.7Ni1.1, Al0.8CoCr0.6Fe0.7Ni1.5, Al0.8CoCr0.6Fe0.7Ni1.8, or Al0.8CoCr0.6Fe0.7Ni2.0. The high-entropy quinary alloy has high strength and high plasticity, and the problem that the strength-plasticity matching performance of a high-entropy alloy in the prior art is poor is solved. The invention further provides a preparation method of the high-entropy quinary alloy with the good high strength and high plasticity matching performance. The preparation method is simple, safe and stable.

Description

technical field [0001] The invention relates to the technical field of metal materials and their preparation, in particular to a high-entropy alloy with excellent strong-plastic matching and a preparation method thereof. Background technique [0002] High-entropy alloys are alloys composed of five or more elements as the main elements, and the atomic percentage of each element is between 5-35%. Compared with traditional alloys, high-entropy alloys have a series of excellent properties due to their unique design concept and microstructure. Such as considerable low temperature, room temperature and high temperature strength, good plasticity and excellent friction resistance and fatigue resistance. However, a large number of subsequent studies have shown that single-phase FCC structure high-entropy alloys have good plasticity and insufficient strength, and single-phase BCC structure high-entropy alloys have good strength but poor plasticity, which means that single-phase struc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C19/058C22C30/00
Inventor 马丽莉王家宁马斌马国俊王宣金培鹏
Owner QINGHAI UNIVERSITY
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