EFFECT OF TEMPERATURE ON MECHANICAL BEHAVIOR OF FeCoCrNiCu HIGH-ENTROPY ALLOY

Dinh-Quan Doan; Thi-Quy Vu; Van-Thang Tran; Huu-Chuyen Vu

Dinh-Quan Doan Faculty of Mechanical Engineering, Hung Yen University of Technology and Education
Thi-Quy Vu Faculty of Mechanical Engineering, Hung Yen University of Technology and Education
Van-Thang Tran Faculty of Mechanical Engineering, Hung Yen University of Technology and Education
Huu-Chuyen Vu Faculty of Mechanical Engineering, Hung Yen University of Technology and Education

Abstract

The mechanical characteristics of the polycrystalline FeCoCrNiCu high-entropy alloy during indentation are studied through molecular dynamics simulation. The influences of temperature on loading force, hardness, shear strain and residual stress distribution, microstructure development, and elastic recovery ratio are analyzed thoroughly. The simulation results show that the loading force and substrate hardness decrease as the increase of substrate temperature. The deformation behavior exhibits that the shear strain and residual stress are extended deep into the substrate along the grain boundary, and the plastic deformation region is intensely enlarged with the increase in temperature. As the temperature rises, the phase transformation from the initial FCC structure to other structures increases significantly, especially the amorphous structure. The result also shows that the dislocation density decreases markedly with increasing temperature. Besides, the indentation under a temperature of 700 K gives a slightly higher elastic recovery than the other temperatures.

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