Strength prediction method of high-entropy alloys with defect structure

Abstract

The invention relates to a method for predicting the strength of a defect-containing structure high-entropy alloy. Effectively combine dislocation theory, crystal plasticity theory, and defect theory to establish relevant strength theoretical models. The influence of dislocations, dislocation loops and severe lattice distortion effects on the properties of high-entropy alloys is considered to achieve quantitative calculation of the strength of high-entropy alloys with defect structures. The yield strength obtained by the prediction method proposed in the present invention is in good agreement with the experimental results. The relevant deformation mechanism analyzed in the present invention is of great significance for studying and predicting the influence of dislocation loop defects on the strength of high-entropy alloys. Through the prediction method proposed in the present invention, the element content of the alloy is regulated, and the influence of different element content on the yield strength is studied, thereby providing theoretical guidance for the design of high-performance high-entropy alloys. In the development process of new alloys, the method effectively avoids a large number of repeated tests, shortens the research and development cycle of high-performance high-entropy alloys, saves costs, and has great engineering value.

Description

technical field [0001] The invention relates to the field of strength prediction of defect-containing structure high-entropy alloys, in particular to dislocation theory, crystal plasticity theory and defect theory. Background technique [0002] In recent years, with the needs of modern industry, high-entropy alloys have been proposed and widely studied and used. Unlike most conventional alloys, high-entropy alloys are composed of four or more elements in equimolar or near-equimolar amounts. Therefore, it has many excellent properties, such as high strength, high hardness, wear resistance, corrosion resistance, high temperature stability, etc. However, various microscopic defects will be generated during its processing and service. For example, in the process of material solidification, the uneven distribution of thermal stress gradient leads to the generation of dislocations; the material undergoes mechanical deformation (forging, rolling), and a large number of defect str...

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Problems solved by technology

[0003] In previous studies, the research on the influence of micro-defects in high-entropy alloys on the strength of materials mostly used experimental measurement methods, and the corresponding theoretical model for the strength of micro-defects in high-entropy alloys has not yet been established.

In addition, the theory of crystal plasticity has not yet been applied to the study of high-entropy alloys

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