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A kind of cocrninbx eutectic medium entropy alloy and preparation method thereof

A technology of entropy alloy and alloy liquid, which is applied in the field of eutectic medium entropy alloy and its preparation, can solve the problems of low strength, insufficient strength, poor castability, etc., and achieve the improvement of hardness and strength, the reduction of defects such as slag inclusion, and the quality of samples Good results

Active Publication Date: 2022-02-01
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Like high-entropy alloys, medium-entropy alloys have poor castability due to the formation of single-phase solid solutions based on a single lattice structure.
At the same time, it is difficult to achieve a balance between the strength and plasticity of the single-phase medium-entropy alloy: the medium-entropy alloy with the single-phase FCC structure has good plasticity but insufficient strength; the single-phase hard BCC structure or contains hard phase intermetallic compounds (such as B2 phase , laves phase) medium entropy alloys have high strength and poor plasticity
CoCrNi medium entropy alloy is a typical single-phase FCC structure medium entropy alloy, which has excellent strength and toughness at room temperature and low temperature, but its strength is still relatively low

Method used

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  • A kind of cocrninbx eutectic medium entropy alloy and preparation method thereof
  • A kind of cocrninbx eutectic medium entropy alloy and preparation method thereof
  • A kind of cocrninbx eutectic medium entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1:

[0034] A CoCrNiNb 0.3 Eutectic medium entropy alloy, the content of its constituent elements Co, Cr, Ni, Nb is 1:1:1:0.3 according to the molar ratio, the specific preparation method is as follows:

[0035] Step 1, pretreatment of high-purity Co, Cr, Ni, Nb elemental metal raw materials. The purity of the high-purity Co block, Cr sheet, Ni block and Nb sheet is not less than 99.95wt.%.

[0036]The specific method is as follows: grind the block Co, then put the Co block, Cr sheet, Ni block and Nb sheet into different beakers respectively, pour a certain amount (just submerged the raw materials) of absolute ethanol, and use Clean with an ultrasonic cleaner for 15 to 20 minutes to remove scale and impurities on the surface of raw materials. Then dry the cleaned raw materials with a blower at low temperature to obtain clean Co, Cr, Ni, Nb raw materials, which are put into clean sample bags for later use.

[0037] Step 2, weighing Co, Cr, Ni, Nb metal elemen...

Embodiment 2

[0046] A CoCrNiNb 0.385 Eutectic medium entropy alloy, the content of its constituent elements Co, Cr, Ni, Nb is 1:1:1:0.385 according to the molar ratio, the specific preparation method is as follows:

[0047] Step 1, pretreatment of high-purity Co, Cr, Ni, Nb elemental metal raw materials. The purity of the high-purity Co block, Cr sheet, Ni block and Nb sheet is not less than 99.95wt.%.

[0048] The specific method is as follows: grind the block Co, then put the Co block, Cr sheet, Ni block and Nb sheet into different beakers respectively, pour a certain amount (just submerged the raw materials) of absolute ethanol, and use Clean with an ultrasonic cleaner for 15 to 20 minutes to remove scale and impurities on the surface of raw materials. Then dry the cleaned raw materials with a blower at low temperature to obtain clean Co, Cr, Ni, Nb raw materials, which are put into clean sample bags for later use.

[0049] Step 2, weighing Co, Cr, Ni, Nb metal elemental raw material...

Embodiment 3

[0058] A CoCrNiNb 0.5 Eutectic medium entropy alloy, its composition elements Co, Cr, Ni, Nb content according to the molar ratio is 1:1:1:0.5, the specific preparation method is as follows:

[0059] Step 1, pretreatment of high-purity Co, Cr, Ni, Nb elemental metal raw materials. The purity of the high-purity Co block, Cr sheet, Ni block and Nb sheet is not less than 99.95wt.%.

[0060] The specific method is as follows: grind the block Co, then put the Co block, Cr sheet, Ni block and Nb sheet into different beakers respectively, pour a certain amount (just submerged the raw materials) of absolute ethanol, and use Clean with an ultrasonic cleaner for 15 to 20 minutes to remove scale and impurities on the surface of raw materials. Then dry the cleaned raw materials with a blower at low temperature to obtain clean Co, Cr, Ni, Nb raw materials, which are put into clean sample bags for later use.

[0061] Step 2, weighing Co, Cr, Ni, Nb metal elemental raw materials according...

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Abstract

The invention discloses a CoCrNiNb x A eutectic medium-entropy alloy and a preparation method thereof belong to the technical field of eutectic medium-entropy alloy and its preparation. The medium entropy alloy of the present invention is CoCrNiNb x , the content of its constituent elements Co, Cr, Ni, and Nb is 1:1:1:x in terms of molar ratio, and x=0.1‑0.5. The present invention also discloses the above-mentioned medium entropy alloy CoCrNiNb x method of preparation. The microstructure of the alloy of the present invention shows that it is composed of a softer FCC solid solution phase and a harder laves intermetallic compound phase, wherein CoCrNiNb 0.385 Alloy microstructure is complete eutectic structure, CoCrNiNb 0.4 The alloy has good comprehensive mechanical properties, which balances the strength and plasticity of the material, and solves the problem of low strength of the entropy alloy in the single-phase FCC structure.

Description

technical field [0001] The invention relates to the technical field of eutectic medium-entropy alloys and their preparation, in particular to a CoCrNiNb x Eutectic medium entropy alloy and method for its preparation. Background technique [0002] High-entropy alloys are multi-principal alloys formed by mixing five or more elements in equiatomic ratios or close to equiatomic ratios proposed by Taiwan scholar Ye Junwei in the 1990s. As a new alloy system, high-entropy alloys have opened up new material design ideas for the entire material field. With the in-depth research on high-entropy alloys, it is found that high-entropy alloys have many special physical and chemical properties and excellent mechanical properties, such as higher strength, hardness, better wear resistance, heat resistance and good high-temperature oxidation sex etc. This makes high-entropy alloys have a wider application prospect. [0003] Unlike traditional alloys, where more elements are added and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C30/00B22D7/00
CPCC22C1/02C22C30/00B22D7/005
Inventor 王海丰张帆黄致远张建宝周青
Owner NORTHWESTERN POLYTECHNICAL UNIV
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