Atomic-scale study of the repeated friction processes of γ/γ' phase nickel-based single crystal alloys

Abstract

The molecular dynamics method was used to simulate the micro-motion friction process of nickel-based single-crystal alloy. With the repeated friction processes increases, the peak friction force gradually increases, the friction coefficient changes more drastically, the transmission of atomic displacement gradually changes from having discontinuity to having continuity, the increment of abrasion depth gradually decreases, the dislocation entanglement is more likely to appear near the two-phase interface, and the friction hardening effect is weakened when the position of the grinding ball is closer to the two-phase interface. The transfer of temperature is relatively linear, which is different from the effect of the amorphous interface layer. Under constant load, the faster the friction speed, the smaller the wear of the workpiece.