Simulation of shear-induced nanograin deformation: the influence of temperature and grain boundary misorientation

The phase-field-crystal method is implemented to study shear-induced nanograin deformation process. The influence of temperature and grain boundary misorientation (GBM) on the evolutionary behavior is analyzed. Temperature has a marked impact on dislocation migration and emission. Dislocation migration in all systems and dislocation emission in large GBM systems are suppressed by low temperature. Sufficiently low temperature can even make microvoids generated based on dislocations. GBM affects dislocation emission and microcrack generation. The increase of GBM can facilitate dislocation emission. The GBM required for dislocation emission increases with temperature decreases. In low temperature systems, evolution of microvoids into microcracks can be promoted by GBM growth.