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High-entropy alloy gradient stress modification technology

A high-entropy alloy and gradient stress technology, applied in the field of plastic modification, can solve problems such as crystal distortion and easy cracking during plastic processing, and achieve the effect of uniform structure, uniform and excellent structure performance, and convenient and simple processing

Inactive Publication Date: 2016-05-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, high-strength high-entropy alloys often need to add more elements with large atomic radius to improve their mechanical properties, resulting in serious crystal distortion and cracking during plastic processing.

Method used

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  • High-entropy alloy gradient stress modification technology

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Embodiment Construction

[0021] Taking AlCoCrFeNiTi as an example, this embodiment is an AlCoCrFeNiTi with uniform structure and significantly improved mechanical properties prepared by high-temperature gradient stress modification technology. 0.5 The method for the high-entropy alloy ingot billet is specifically completed according to the following steps:

[0022] (1) Preparation of high-entropy alloy AlCoCrFeNiTi 0.5 Ingot casting: the selected composition is AlCoCrFeNiTi 0.5 In the ingot of the high-entropy alloy, the molar ratios of the six elements are Al:Co:Cr:Fe:Ni:Ti=1:1:1:1:1:0.5.

[0023] (2) Homogenization heat treatment: AlCoCrFeNiTi selected in step (1) 0.5 The high-entropy alloy ingot is subjected to homogenization heat treatment. The temperature of the homogenization heat treatment is 1000°C-1100°C, and then the heat preservation treatment is carried out according to the thickness of the ingot 0.8-1min / mm. The heat preservation time of the homogenization heat treatment is 12h-100h, an...

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Abstract

The invention relates to a gradient stress plasticity modification method which specially aims at damage control and fine structure regulation of high-entropy alloy material characteristics. The purpose of the method is to solve the problems that a high-entropy alloy casting state structure is mainly composed of bulky pine-tree crystals, and the comprehensive mechanical property of the high-entropy alloy casting state structure is poor. A preparation method mainly comprises the steps that a high-entropy alloy ingot is prepared; homogenization heat treatment, analogue simulation and canned forging are conducted; and a high-entropy alloy ingot blank is obtained. When the high-entropy alloy ingot is processed, preset variable cross-section canning is mainly adopted, the stress state of the interior of a high-entropy alloy material in the process is effectively controlled, and the gradient three-way compressive stress combined with deformation characteristics is formed. By means of the gradient stress plasticity modification method, initiation and propagation of microcracks induced by lattice distortion can be effectively inhibited finally, crystalline grains are refined, the comprehensive mechanical property is improved, and effective modification of the high-entropy alloy is achieved.

Description

technical field [0001] The invention relates to a plastic modification method specially aimed at damage control and fine structure regulation of high-entropy alloy material characteristics. Background technique [0002] With the development of modern industry, people put forward higher and higher requirements for materials in terms of temperature, strength, hardness and wear resistance. Although people continue to try to develop new processing technologies and design new material components to compensate Insufficient performance of materials, but the inherent defects of this traditional alloy design have seriously restricted the development of the industry. It is against this background that people have broken the traditional alloy design concept and adopted the concept of multi-principal alloy to design a new type of alloy system, high-entropy alloy. [0003] High-entropy alloys are different from traditional alloys based on one or two elements as the main elements, and th...

Claims

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Application Information

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IPC IPC(8): C22F1/16
CPCC22F1/16
Inventor 李洪洋吕娜张妍婧俞治平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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