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A kind of high-strength high-plasticity eutectic high-entropy alloy and preparation method thereof

A high-entropy alloy and high-plastic technology, which is applied in the field of high-strength and high-plastic eutectic high-entropy alloy and its preparation, can solve the problems of inability to have high strength and high plasticity at the same time, easy segregation, poor fluidity, etc., so as to improve the oxidation resistance. , It is not easy to segregate elements and improve the effect of high temperature stability

Active Publication Date: 2020-04-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a high-strength, high-plasticity eutectic high-entropy alloy and a preparation method thereof for existing high-entropy alloys that cannot simultaneously have high strength and high plasticity, easy segregation, and poor fluidity. High-entropy alloys are composed of face-centered cubic phase and body-centered cubic phase, in which the face-centered cubic phase provides plasticity, and the body-centered cubic phase provides strength, so that the alloy maintains good shape while achieving high strength

Method used

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  • A kind of high-strength high-plasticity eutectic high-entropy alloy and preparation method thereof
  • A kind of high-strength high-plasticity eutectic high-entropy alloy and preparation method thereof
  • A kind of high-strength high-plasticity eutectic high-entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A high-strength and high-plastic eutectic high-entropy alloy, the chemical formula of which is Ni 30 co 30 Fe 10 Cr 10 Al 18 W 2 , abbreviated as Ni 30 ; Wherein, the ratio of each element is mole percent.

[0025] A kind of Ni 30 co 30 Fe 10 Cr 10 Al 18 W 2 The preparation method of eutectic high-entropy alloy comprises the following steps:

[0026] S1. Ultrasonic cleaning: the Ni, Co, Fe, Cr, Al, W alloy raw materials are mechanically ground to remove the oxide skin on the surface of the element, then placed in different containers and added with alcohol solution, ultrasonically cleaned, taken out and dried with alcohol to obtain Six raw materials after ultrasonic treatment;

[0027] S2. Ingredients: Weigh 12.89g of Ni, 12.95g of Co, 4.10g of Fe, 3.81g of Cr, 3.56g of Al and 2.69g of W metal raw materials obtained in S1 according to the molar percentage of the eutectic high-entropy alloy and mixed;

[0028] S3: Master alloy smelting: Put the raw materia...

Embodiment 2

[0031] A high-strength and high-plastic eutectic high-entropy alloy, the chemical formula of which is Ni 36 co 24 Fe 10 Cr 10 Al 18 W 2 , abbreviated as Ni 36 ; Wherein, the ratio of each element is mole percent.

[0032] The eutectic high-entropy alloy Ni 36 The preparation method is the same as the preparation method of Example 1, except that what weighed in S2 is 15.48g of Ni, 10.36g of Co, 4.10g of Fe, 3.81g of Cr, 3.56g of Al and 2.69g of W Metal raw materials.

Embodiment 3

[0034] A high-strength and high-plastic eutectic high-entropy alloy, the chemical formula of which is Ni 40 co 20 Fe 10 Cr 10 Al 18 W 2 , abbreviated as Ni 40 ; Wherein, the ratio of each element is mole percent.

[0035] The eutectic high-entropy alloy Ni 40The preparation method is the same as the preparation method of Example 1, except that what weighed in S2 is 17.20g of Ni, 8.63g of Co, 4.10g of Fe, 3.81g of Cr, 3.56g of Al and 2.69g of W Metal raw materials.

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Abstract

The invention discloses a high-strength and high-plasticity eutectic high-entropy alloy and a preparation method thereof. The high-strength and high-plasticity eutectic high-entropy alloy is preparedfrom the major elements of Ni, Co, Fe, Cr, Al and the trace elements X; the alloy composition is NiaCobFecCrdAleXf, wherein a, b, c, d, e and f represent the molar percentages of the corresponding elements, a+b is greater than or equal to 58 and less than or equal to 62, a is greater than or equal to b, c+d is greater than or equal to 18 and less than or equal to 22, c is greater than or equal tod, e is greater than or equal to 17 and less than or equal to 19, and f is less than or equal to 5.3; and the trace elements X comprise the following elements of W, Nb, Mo, B and C. The preparation method for the eutectic high-entropy alloy comprises the following steps that firstly, the alloying elements of the Ni, the Co, the Fe, the Cr, the Al and the X are descaled and cleaned and are weighedand mixed according to a certain molar ratio, a mother alloy is smelted, and finally suction casting is carried out so as to obtain the eutectic high-entropy alloy. The alloy combines the face-centered cubic phase and the body-centered cubic phase and has the advantages of being high in strength and high in plasticity, the elements such as the Al, the Cr and the W are beneficial to the improvementof the oxidation resistance, the corrosion resistance and the high-temperature stability of the alloy, and the comprehensive performance of the alloy is quite excellent.

Description

technical field [0001] The invention relates to the technical field of metal materials and their preparation, in particular to a high-strength, high-plastic eutectic high-entropy alloy and a preparation method thereof. Background technique [0002] High-entropy alloys are a new class of metal materials composed of a variety of main elements, which have the characteristics of high mixing entropy and severe lattice distortion. High-entropy alloys exhibit a series of excellent properties such as high strength, high hardness, and high radiation resistance, and become potential structural materials in the future, and have broad application prospects in extreme conditions such as aerospace. However, the high-entropy alloys currently studied are mainly single-phase solid solution structures. Among them, the face-centered cubic high-entropy alloy has excellent plasticity but poor strength, and the body-centered cubic high-entropy alloy has good strength but the plasticity is far fro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C19/057C22C19/07C22C30/00
Inventor 王志军吴庆峰李俊杰王锦程
Owner NORTHWESTERN POLYTECHNICAL UNIV
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