Molecular dynamics study on tribological properties of AlCrFeCoNi HEA at different temperatures

The microscopically wear mechanism of AlCrFeCoNi HEA effected by high temperatures still remains unclear. In this work, the tribological properties of AlCrFeCoNi HEA and tungsten carbide (WC) at temperatures ranging from 250, 400, 550, 700, 850 degrees C was investigated using molecular dynamics methods. Additionally, the shear strain, contact stress, and energy change at different temperatures were analyzed to explore the atomic wear mechanism. The simulated results indicated that the coefficient of friction and wear rate decrease with the increasing temperature, since the dislocation types decrease and the kinetic energy and total system energy increase. And high temperature can inhibit the synergistic effect of strain accumulation and atomic wear on the surface of AlCrFeCoNi HEAs.