Molecular dynamics analysis of friction damage on nano-twin 6 H-SiC surface

In order to investigate the deformation and damage of nano-twin 6 H-SiC after friction, a three-dimensional model was established. It is found that the barrier formed by layered faults can block the propagation of stress and hinder the formation and expansion of dislocation. The strength of the twins shows Hall-Petch phenomenon, and the strength is the highest when the thickness is 10.3 nm. The twin boundary is the initial point of deformation damage, and the greater the thickness of the twin, the greater the damage. The "Point-Line-Plane" destruction in twin crystals has a great influence on the processing of crystal materials.