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High-strength refractory six-element high-entropy alloy CoCrFeNiVAlx and preparation method thereof

A high-entropy alloy and high-strength technology, which is applied in the field of high-entropy alloys, can solve the problems of burning loss of Al-added elements and uneven melting, and achieve the effects of easy burning loss, precise alloy composition ratio, and high strength

Inactive Publication Date: 2018-07-31
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention adopts an intermediate alloying method to prepare the target alloy, which can well solve the problem of uneven melting of high-entropy alloys with six elements and above and the burning loss of Al added, improve the quality of vacuum melting, and improve the structure of the alloy structure, thereby improving the comprehensive mechanical properties of the alloy

Method used

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  • High-strength refractory six-element high-entropy alloy CoCrFeNiVAlx and preparation method thereof
  • High-strength refractory six-element high-entropy alloy CoCrFeNiVAlx and preparation method thereof
  • High-strength refractory six-element high-entropy alloy CoCrFeNiVAlx and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0032]A high-strength refractory five-element high-entropy alloy, the high-entropy alloy composition is CoCrFeNiV, and the purity of each component element of the alloy is ≥99.9%. The surface oxide skin of the raw material is removed by mechanical methods such as files and sandpaper, and industrial ethanol is used Clean, use the electronic balance to weigh according to the proportion shown in Table 1, and the error is controlled at 3 / 10,000.

[0033] Table 1: Raw material ratio of each component of the alloy

[0034]

[0035] In the embodiment of the present invention, a WK type non-consumable vacuum arc melting furnace is used, equipped with a water-cooled copper crucible, and an intermediate alloying method is used to prepare the target alloy.

[0036] The specific operation steps are as follows:

[0037] (1) Put Co, Ni and Fe with lower melting points into the water-cooled copper crucible in the non-consumable vacuum electric arc furnace in order of melting point from l...

Embodiment 2

[0041] A high-strength refractory five-element high-entropy alloy, the high-entropy alloy composition is CoCrFeNiVAl 0.5 , the purity of each component element of the alloy is ≥99.9%. Use mechanical methods such as files and sandpaper to remove the surface oxide skin of the raw material, and use industrial ethanol to clean it. Use an electronic balance to weigh according to the ratio shown in Table 2, and the error is controlled within 10,000. the third.

[0042] Table 2: Raw material ratio of each component of the alloy

[0043]

[0044] In the embodiment of the present invention, a WK type non-consumable vacuum arc melting furnace is used, equipped with a water-cooled copper crucible, and an intermediate alloying method is used to prepare the target alloy.

[0045] The specific operation steps are as follows:

[0046] (1) Put Co, Ni, Al and Fe with lower melting points into the water-cooled copper crucible in the non-consumable vacuum electric arc furnace in order of me...

Embodiment 3

[0050] A high-strength refractory five-element high-entropy alloy, the high-entropy alloy composition is CoCrFeNiVAl 1.0 , the purity of each component element of the alloy is ≥99.9%. Use mechanical methods such as files and sandpaper to remove the oxide skin on the surface of the raw material, and use industrial ethanol to clean it. Use an electronic balance to weigh according to the ratio shown in Table 3. The error is controlled within ten thousand the third.

[0051] Table 3: Raw material ratio of each component of the alloy

[0052]

[0053] In the embodiment of the present invention, a WK type non-consumable vacuum arc melting furnace is used, equipped with a water-cooled copper crucible, and an intermediate alloying method is used to prepare the target alloy.

[0054] The specific operation steps are as follows:

[0055] (1) Put Co, Ni, Al and Fe with lower melting points into the water-cooled copper crucible in the non-consumable vacuum electric arc furnace in ord...

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Abstract

The invention discloses a high-strength refractory six-element high-entropy alloy CoCrFeNiVAlx and a preparation method thereof. The high-strength refractory six-element high-entropy alloy is composedof cobalt, chromium, iron, nickel, vanadium and aluminum which all have the purity of at least 99.9%; and all the elements are calculated according to the atomic percent, specifically, Co is 14-20 at%, Cr is 14-20 at%, Fe is 14-20 at%, Ni is 14-20 at%, V is 14-20 at%, and Al is 0-30 at%. The alloy is prepared through an intermediate alloying method, and the preparation steps include that Co, Ni,Fe and Al which are low in melting point are mixed and molten, Cr and V which are high in melting point are mixed and molten, smelting is performed repeatedly for several times, then two intermediatealloys are smelted, and smelting is performed repeatedly for several times so as to guarantee the uniformity. By means of the high-entropy alloy CoCrFeNiVAlx obtained through the method, the problemsthat Al is prone to being damaged by burning and multi-element alloy smelting is non-uniform can be solved excellently, the strength, hardness and plasticity are high, and the high-strength refractorysix-element high-entropy alloy CoCrFeNiVAlx and the preparation method thereof can be applied to the fields of aerospace, mechanical heavy industries and the like.

Description

technical field [0001] The invention relates to the technical field of high-entropy alloys, in particular to a high-strength refractory six-element high-entropy alloy CoCrFeNiVAl x and its preparation method. Background technique [0002] Traditional alloys usually use one or two metal elements as matrix elements. According to people's performance requirements, specific trace alloy elements are added to improve the performance of the original alloy system. With the development of society, people's demand for materials is increasing, and traditional alloy materials can no longer meet people's demanding requirements for high-performance materials. In 2004, Taiwanese scholar Ye Junwei broke the traditional design concept of alloys, and took the lead in proposing a new total design concept, and named this type of alloy as high-entropy alloy. [0003] High-entropy alloys were originally defined as five or more components, which are formed by melting, sintering, etc. according t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/03
CPCC22C30/00C22C1/03C22C19/07
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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