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CoCrNiNbx eutectic intermediate entropy alloy and preparation method thereof

A technology of entropy alloys and metal raw materials, which is applied in the field of eutectic medium entropy alloys and its preparation, can solve the problems of insufficient strength, poor castability, poor strength and plasticity, etc., and achieve the effect of reducing defects such as slag inclusions and good sample quality

Active Publication Date: 2019-12-27
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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  • CoCrNiNbx eutectic intermediate entropy alloy and preparation method thereof
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  • CoCrNiNbx eutectic intermediate entropy alloy and preparation method thereof

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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, pour a certain amount of absolute ethanol (just submerged the raw materials), 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 elemental raw mate...

Embodiment 2

[0046] A CoCrNiNb 0.385 Eutectic medium entropy alloy, the content of its constituent elements Co, Cr, Ni, and 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, pour a certain amount of absolute ethanol (just submerged the raw materials), 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 materials accordi...

Embodiment 3

[0058] A CoCrNiNb 0.5 Eutectic medium entropy alloy, the content of its constituent elements Co, Cr, Ni, and Nb is 1:1:1:0.5 according to the molar ratio, and 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, pour a certain amount of absolute ethanol (just submerged the raw materials), 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 accordi...

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Abstract

The invention discloses a CoCrNiNbx eutectic intermediate entropy alloy and a preparation method thereof and belongs to the technical fields of eutectic intermediate entropy alloys and preparation thereof. The entropy alloy is CoCrNiNbx and comprises component elements of Co, Cr, Ni and Nb, wherein the content ratio of the Co to the Cr to the Ni to the Nb is 1 to 1 to 1 to x, and x is 0.1 to 0.5.The invention further discloses the preparation method of the entropy alloy CoCrNiNbx. The microstructure of the alloy consists of a softer FCC solid solution phase and a harder laves intermetallic phase; a CoCrNiNb0.385 ally microstructure is a complete eutectic structure; and a CoCrNiNb0.4 alloy has better comprehensive mechanical properties, so that the strength and the plasticity of the material reach the balance, and the problem of lower strength of an entropy alloy in a single-phase FCC structure is solved.

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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IPC IPC(8): C22C1/02C22C30/00B22D7/00
CPCC22C1/02C22C30/00B22D7/005
Inventor 张帆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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