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Quaternary hypoeutectic high-entropy alloy excellent in strength and plasticity match and preparation method thereof

A high-entropy alloy and hypoeutectic technology, which is applied in the field of quaternary hypoeutectic high-entropy alloy and its preparation, can solve the problems that cannot overcome the trade-off between strength and plasticity, and achieve a simple, reliable and safe preparation method , The effect of fine eutectic phase

Active Publication Date: 2019-08-27
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-entropy alloys with a single-phase structure generally cannot overcome the trade-off between strength and plasticity

Method used

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  • Quaternary hypoeutectic high-entropy alloy excellent in strength and plasticity match and preparation method thereof
  • Quaternary hypoeutectic high-entropy alloy excellent in strength and plasticity match and preparation method thereof
  • Quaternary hypoeutectic high-entropy alloy excellent in strength and plasticity match and preparation method thereof

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Experimental program
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Embodiment 1

[0032] A quaternary hypoeutectic high-entropy alloy Al with strong plasticity and good matching 14 Cr 28 Fe 28 Ni 30 The specific steps are as follows:

[0033] Use SiC sandpaper and a grinder to remove the surface impurities and oxides of Al, Co, Cr and Ni elemental metal raw materials, and then place them in different containers to add alcohol and ultrasonically clean twice. The purity of Al, Co, Cr and Ni elemental metal raw materials are all Not less than 99.9wt%,

[0034] Weigh the Al, Co, Cr and Ni elemental metal raw materials after ultrasonic cleaning according to the molar ratio of 14:28:28:30, mix the raw materials with a total mass of 80g and place them in a high vacuum non-consumable arc melting furnace. , Under the protection of argon, at a vacuum degree of 2.5×10 ﹣3 Electric arc smelting under MPa, smelting time 8min, obtain alloy liquid, stir and cool, obtain alloy ingot;

[0035] Repeat the arc melting, stirring and cooling process after turning the alloy ingot;

[00...

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Abstract

The invention discloses a quaternary hypoeutectic high-entropy alloy excellent in strength and plasticity match. The quaternary hypoeutectic high-entropy alloy consists of a component of AlxCoyCrzNiw,wherein x, y, z and w respectively are molar ratios of corresponding elements, the molar ratios meet the relationships: 16>=x>=12, 30>=y>=26, 30>=z>=26, and 32>=w>=28. The quaternary hypoeutectic high-entropy alloy is of hypoeutectic structure, and excellent in strength and plasticity match. Simultaneously, the invention further provides a preparation method of the quaternary hypoeutectic high-entropy alloy. The preparation method includes: first, removing oxide skin from the elementary metals, weighing and mixing the elementary metals according to the molar ratios to obtain a mixture, placing the mixture in a high vacuum non-self-consuming arc melting furnace, performing electric arc melting in vacuum under argon protection, obtaining an alloy solution, stirring and cooling the alloy solution, obtaining an alloy ingot, repeating smelting for four times to obtain a high-entropy alloy, removing oxide skin from the obtained high-entropy alloy, performing ultrasonic cleaning twice by using ethyl alcohol, placing a clean alloy ingot in a high vacuum arc smelting rollover casting and centrifugation casting system, pouring molten alloy obtained after remelting into a copper mold, and then obtaining a high-entropy alloy test sample Al14Co28Cr28Ni30. The preparation method is simple, safe and stable.

Description

Technical field [0001] The invention relates to the technical field of metal materials and their preparation, in particular to a quaternary hypoeutectic high-entropy alloy with good strong plasticity matching and a preparation method thereof. Background technique [0002] High-entropy alloys have aroused extensive research interest because of their excellent high-temperature mechanical properties, corrosion resistance, wear resistance and oxidation resistance. Most of the high-entropy alloys reported in the past have a single face-centered cubic (FCC) or body-centered cubic (BCC) phase structure. However, high-entropy alloys with a single-phase structure generally cannot overcome the trade-off between strength and plasticity. Therefore, in order to achieve a balance between strength and plasticity, a dual-phase structure high-entropy alloy combining "soft" and "hard" is designed. [0003] For dual-phase structure alloys, its mechanical properties are closely related to the size, ...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C19/058C22C30/00
Inventor 马丽莉王家宁马国俊马斌高满金培鹏
Owner QINGHAI UNIVERSITY
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