Molecular dynamics simulation of a new inhomogeneous concentration distribution model based on frictional behavior of FeNiCrCoCu high- entropy alloy

JZ Qiu and ZH Xu and JR Song and CX Hu and LL Miao and XD He, MATERIALS TODAY COMMUNICATIONS, 35, 106337 (2023).

DOI: 10.1016/j.mtcomm.2023.106337

High-entropy alloys (HEA) have excellent mechanical properties and wear properties, and they have a powerful role in wear materials. In this study, the molecular dynamics (MD) method was used to investigate the friction and wear properties of FeNiCrCoCu high-entropy alloy. Firstly, the effects of cutting speed, cutting depth, cutting environment temperature, and alloy concentration on the frictional behavior were explored by analyzing friction coefficient, stress distribution, and dislocation in the wear model of FeNiCrCoCu high-entropy alloy. The results show that the increase in friction speed will lead to more intense heating. Compared to lower friction speeds, more high- temperature areas will be formed. By the way, the temperature in these regions mainly diffuses perpendicular to the friction direction. During the friction process, the increase of the friction environment temperature will lead to local stress concentration phenomenon and the appearance of low-stress areas. In addition, based on the above research on the friction mechanism of FeNiCrCoCu high-entropy alloy, a new model based on the concentration distribution is proposed. Through the analysis of its wear degree, it is found that the structure can effectively reduce the wear situation of the material, the reason is that the model can effectively impede the movement of dislocation lines and improve the wear resistance of the alloy. It is of great significance to improve the frictional wear performance of the alloy structure.

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