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Five-element high-entropy alloy Cu0.5FeNiVAlx and strength and hardness improvement method thereof

A high-entropy alloy, high-strength technology, applied in the field of high-entropy alloys, to achieve the effect of broadening the application range and application prospects, improving performance, and increasing economic value

Active Publication Date: 2018-08-31
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the basis of the high compressive strength in the original as-cast state, further improving the strength and hardness of the high-entropy alloy will help the transformation of the high-entropy alloy from the research of the as-cast state to the research of the heat treatment process. There are few studies on improving the mechanical properties of high-entropy alloys, so accelerating the pace of high-entropy alloy laboratory research to the actual production development stage will effectively broaden the application range of high-entropy alloys

Method used

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  • Five-element high-entropy alloy Cu0.5FeNiVAlx and strength and hardness improvement method thereof
  • Five-element high-entropy alloy Cu0.5FeNiVAlx and strength and hardness improvement method thereof
  • Five-element high-entropy alloy Cu0.5FeNiVAlx and strength and hardness improvement method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A Quaternary High-Entropy Alloy Cu 0.5 For FeNiV, the purity of the alloy raw materials used is ≥99.9%, and the impurities and oxides on the surface of the raw materials are removed by mechanical means, and then cleaned and dried with industrial ethanol, and weighed with an electronic balance according to the ratio shown in Table 1. The weighing error Less than three ten thousandths.

[0039] Table 1: Alloy raw material ratio

[0040] sample

mark

Cu

Fe

Ni

V

Al

Cu 0.5 FeNiV

Al 0

14.29

28.57

28.57

28.57

0

[0041] In this example, WK-Ⅱ type non-consumable vacuum arc melting is used to prepare quaternary high-entropy alloy Cu 0.5 FeNiV, the specific steps are as follows:

[0042] (1) put into water-cooled copper crucible after alloy raw material copper, iron, nickel, vanadium are calculated and weighed according to atomic percentage;

[0043] (2) Turn on the mechanical pump to evacuate the melting furnace ...

Embodiment 2

[0050] A five-element high-entropy alloy Cu 0.5 FeNiVAl 0.2 , the purity of the alloy raw materials used are all ≥99.9%, the impurities and oxides on the surface of the raw materials are removed by mechanical means, and then cleaned and dried with industrial ethanol, and weighed with an electronic balance according to the ratio shown in Table 2, and the weighing error is less than Three out of ten thousand.

[0051] Table 2: Alloy raw material ratio

[0052] sample

mark

Cu

Fe

Ni

V

Al

Cu 0.5 FeNiVAl 0.2

Al 0.2

13.50

27.03

27.03

27.03

5.41

[0053] In this example, WK-II non-consumable vacuum arc melting is used to prepare five-element high-entropy alloy Cu 0.5 FeNiVAl 0.2 ,Specific steps are as follows:

[0054] (1) Put alloy raw material copper, iron, nickel, vanadium, aluminum into water-cooled copper crucible after calculating and weighing according to atomic percentage;

[0055] (2) Turn on the molecula...

Embodiment 3

[0062] A five-element high-entropy alloy Cu 0.5 FeNiVAl 0.5 , the purity of the alloy raw materials used are all ≥99.9%. The impurities and oxides on the surface of the raw materials are removed by mechanical means, and then cleaned and dried with industrial ethanol. The electronic balance is used to weigh according to the ratio shown in Table 3. The weighing error is less than Three out of ten thousand.

[0063] Table 3: Ratio of Alloy Raw Materials

[0064] sample

mark

Cu

Fe

Ni

V

Al

Cu 0.5 FeNiVAl 0.5

Al 0.5

12.50

25.00

25.00

25.00

12.50

[0065] In this example, WK-II non-consumable vacuum arc melting is used to prepare five-element high-entropy alloy Cu 0.5 FeNiVAl 0.5 ,Specific steps are as follows:

[0066] (1) Put alloy raw material copper, iron, nickel, vanadium, aluminum into water-cooled copper crucible after calculating and weighing according to atomic percentage;

[0067] (2) Turn on the mechan...

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Abstract

The invention discloses five-element high-entropy alloy Cu0.5FeNiVAlx and a strength and hardness improvement method thereof. The five-element high-entropy alloy Cu0.5FeNiVAlx mainly comprises Cu, Fe,Ni, V and Al with purities greater than or equal to 99.9%. The five-element high-entropy alloy Cu0.5FeNiVAlx comprises, by atomic percent, 10 to 15 at% of the Cu, 20 to 30 at% of the Fe, 20 to 30 at%of the Ni, 20 to 30 at% of the V, and 0 to 26 at% of the Al. A preparation method of the five-element high-entropy alloy Cu0.5FeNiVAlx is as follows: performing arc-strike smelting in a vacuum environment protected by argon gas on the alloy raw materials Cu, Fe, Ni, V and Al for repeated several times. The strength and hardness improvement method of the five-element high-entropy alloy Cu0.5FeNiVAlx is as follows: using a quartz tube for vacuum sealing of a prepared Cu0.5FeNiVAlx ingot, then using a muffle furnace at 500 DEG C, 750 DEG C and 1000 DEG C respectively for annealing treatment, andfinally thermally-insulating and cooling to room temperature. The five-element high-entropy alloy Cu0.5FeNiVAlx obtained by the method has an effective improvement in strength and hardness, and contributes to broadening the application range of a high-entropy alloy and improving the economic value.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloys, in particular to a five-element high-entropy alloy Cu 0.5 FeNiVAl x and a method for improving its strength and hardness. Background technique [0002] The traditional alloy design concept is generally based on one or two elements as the matrix, and then according to people's special needs for certain mechanical properties, appropriate trace elements are added to improve a certain mechanical property of the alloy system. The traditional design concept has fewer alloy systems, which cannot meet the demanding requirements of social progress for materials. In 2004, Taiwanese scholar Professor Ye Junwei broke the traditional alloy design concept and proposed the design concept of high-entropy alloy. That is, five to thirteen alloy components are mixed according to an equiatomic ratio or close to an equiatomic ratio, and the percentage content of each component is between 5% and 35%. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22C1/02C22F1/00C21D1/26C22B9/20C22B9/04
CPCC21D1/26C22B9/04C22B9/20C22C1/02C22C30/02C22F1/00
Inventor 湛永钟丁晓龙张坤韩峰郭付达甘夏霞李吉东叶海梅
Owner GUANGXI UNIV
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