Defective structure-containing high-entropy alloy strength prediction method

Abstract

The invention relates to a method for predicting the strength of a high-entropy alloy with a defect structure. A dislocation theory, a crystal plasticity theory and a defect theory are effectively combined to establish a related strength theoretical model. The influence of dislocation, a dislocation ring and a serious lattice distortion effect on the performance of the high-entropy alloy is considered, and quantitative calculation of the strength of the high-entropy alloy containing the defect structure is achieved. The yield strength obtained by the prediction method provided by the invention is well matched with an experimental result. The related deformation mechanism analyzed in the method is of great significance to research and predict the influence of dislocation ring defects on the strength of the high-entropy alloy. Through the prediction method provided by the invention, the element content of the alloy is regulated and controlled, and the influence of different element contents on the yield strength is researched, so that theoretical guidance is provided for the design of the high-performance and high-entropy alloy. In the development process of the new alloy, the method effectively avoids a large number of repeated tests, shortens the research and development period of the high-performance high-entropy alloy, saves the cost, and has huge engineering value.

Description

technical field [0001] The invention relates to the field of strength prediction of high-entropy alloys with defect-containing structures, and specifically relates to dislocation theory, crystal plasticity theory and defect theory. A theoretical model is established to consider the effects of microscopic defects and severe lattice distortion to realize the prediction of the strength of high-entropy alloys containing defects. 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 traditional alloys, high-entropy alloys are composed of four or more elements in equimolar or nearly 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 occur during its processing and service. For example, during the solidification...

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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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