VELOCITY-DEPENDENT DEFORMATION MECHANISM OF FeNiCrCoTi HIGH-ENTROPY ALLOY UNDER VIBRATION-ASSISTED MACHINING

Abstract

Vibration-assisted machining has shown great potential for improving the processing of hard and tough materials, but its mechanisms in high-entropy alloys (HEAs) remain unclear. In this study, molecular dynamics simulations are employed to investigate the velocity-dependent behavior of FeNiCrCoTi monocrystal during vibration-assisted nano-machining. The study examines machining forces, shear strain, von Mises stress, dislocation evolution, temperature distribution, and surface morphology. The results reveal that higher velocities increase normal and tangential forces, stress concentration, and local temperature, while reducing shear strain, dislocation accumulation, groove width, and worn atom number. These findings provide new atomistic insights into the deformation and material removal mechanisms of HEAs under vibration-assisted machining.