Phenomenon of anti-driving force during grain boundary migration

Abstract

Grain boundary motion is a crucial process in the evolution of microstructure in materials. It is essential to comprehend the intricate behaviors associated with grain boundary migration. In this study, findings from atomistic simulations indicating that an increase in the driving force may result in slower grain boundary movement were presented. Additionally, switches in the mode of grain boundary shear coupling migration were observed. Notably, there were discernible differences in stress levels of the system and average atom energy of the grain boundary before and after the transition point. The occurrence of shear coupling behavior led to a reduction in stress. Consequently, it can be inferred that shear coupling is an effective mechanism for alleviating stress in materials. These findings provide valuable insights into the complex behaviors of grain boundary migration, as well as the potential use of shear coupling for stress relaxation and microstructure manipulation in materials.