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High-strength and high-plasticity six-element eutectic high-entropy alloy and preparation method thereof

A high-plastic six-element eutectic and high-entropy alloy technology, applied in the field of high-entropy alloys, can solve problems such as single system, imperfect heat treatment process, and small number of components, and achieve uniform structure, simple and reliable melting and annealing process , the effect of less casting defects

Active Publication Date: 2022-07-01
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose a high-strength and high-plasticity high-entropy alloy with a single system, a small number of components, and an imperfect heat treatment process for the current eutectic high-entropy alloy with high tensile strength and good fracture toughness matching. Meta-eutectic high-entropy alloy, the hexa-eutectic high-entropy alloy presents an irregular eutectic structure in the cast state, and the eutectic phase structure is determined by FCC and M 3 B 2 Types of borides composed of

Method used

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  • High-strength and high-plasticity six-element eutectic high-entropy alloy and preparation method thereof
  • High-strength and high-plasticity six-element eutectic high-entropy alloy and preparation method thereof
  • High-strength and high-plasticity six-element eutectic high-entropy alloy and preparation method thereof

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Embodiment 1

[0036] This embodiment discloses a high-strength and high-plastic hexagonal eutectic high-entropy alloy whose general formula is CoCrNi 2 V 0.48 B 0.32 Si 0.16 Hypoeutectic high-entropy alloy composition.

[0037] In the present embodiment, the steps of a preparation method of a high-strength and high-plastic hexagonal eutectic high-entropy alloy are as follows:

[0038]Step 1. Use SiC sandpaper to grind Co, Cr, Ni and V gold with a purity of 99.95wt.% metal elemental raw materials to remove the oxide scale and impurities on the surface, then place them in different containers, add alcohol, and carry out ultrasonic cleaning; For B and Si non-metallic raw materials with a purity of 99.99 wt.%, only ultrasonic cleaning is performed without participating in the surface grinding process. After the cleaned elemental raw materials are fully dried, put them into sealed bags separately for use;

[0039] Step 2. Convert based on the element molar ratio to the mass ratio, and based...

Embodiment 2

[0045] This embodiment discloses a high-strength and high-plastic hexagonal eutectic high-entropy alloy whose general formula is CoCrNi 2 V 0.63 B 0.42 Si 0.21 Fully eutectic high-entropy alloy composition.

[0046] In the present embodiment, the steps of a preparation method of a high-strength and high-plastic hexagonal eutectic high-entropy alloy are as follows:

[0047] Step 1. Use SiC sandpaper to polish the pure metal raw materials Co, Cr, Ni and V gold with a purity of 99.95wt.% to remove the oxide scale and impurities on the surface, then place them in different containers, add alcohol, and carry out ultrasonic cleaning ; For B and Si non-metallic raw materials with a purity of 99.99wt.%, only ultrasonic cleaning is performed without participating in the surface grinding process. After the cleaned elemental raw materials are fully dried, put them into sealed bags separately for use;

[0048] Step 2. Convert based on the element molar ratio to the mass ratio, and ba...

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Abstract

The invention provides a high-strength and high-plasticity six-element eutectic high-entropy alloy and a preparation method thereof. The general formula of the eutectic high-entropy alloy is CoCrNi2VxBySiz, x is more than or equal to 0.3 and less than or equal to 0.9, y is more than or equal to 0.2 and less than or equal to 0.6, z is more than or equal to 0.1 and less than or equal to 0.3, and x, y and z are respectively molar ratios of corresponding elements. The invention further discloses a preparation method of the eutectic high-entropy alloy. The eutectic high-entropy alloy is of an irregular eutectic microstructure in an as-cast state, and the phase structure is composed of FCC and M3B2 type borides. After specific two-stage annealing treatment, the comprehensive mechanical property of the eutectic high-entropy alloy is greatly improved, the tensile strength of the eutectic high-entropy alloy reaches up to 1016-1153 MPa, the elongation at break is 10.9-20.1%, and therefore the eutectic high-entropy alloy has wide application prospects in the engineering field.

Description

technical field [0001] The invention relates to high-entropy alloy technology, in particular to a high-strength and high-plastic hexagonal eutectic high-entropy alloy and a preparation method thereof. Background technique [0002] In recent years, high-entropy alloys have received extensive attention in the field of materials research due to their excellent mechanical properties and special functionality. Although it is composed of various components, it still maintains a simple single-phase solid solution structure in the as-cast state. For example, single-phase face-centered cubic solid solution structure and single-phase body-centered cubic solid solution structure. In general, high-entropy alloys with a single-phase face-centered cubic solid solution structure show good plasticity, but low strength; while high-entropy alloys with a single-phase body-centered cubic solid solution structure have high strength, but poor plasticity. In addition, high-entropy alloys suffer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/10C22F1/00C22C32/00
CPCC22C30/00C22C1/1036C22F1/00C22C32/0073
Inventor 卢一平张令坤李廷举王同敏曹志强接金川康慧君郭恩宇张宇博
Owner DALIAN UNIV OF TECH
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