Crystal plasticity analysis of the plastic slip deformation and evolution of atomic vacancy density in polycrystalline metals under cyclic loading

Abstract

The plastic slip deformation and evolution of atomic vacancy density in Cu polycrystal subjected to cyclic loading was numerically analyzed by using crystal plasticity analysis. Slip deformation and strain hardening are evaluated by dislocation density-based models. Generation rate of atomic vacancies is given by the model proposed by Essmann and Mughrabi (1979). A cyclic loading condition is 5 cycle from 0 to 0.5 % nominal strain. The work hardening rate of cyclic loading deformation was lower than monotonic loading deformation. The lower work hardening rate of cyclic load deformation caused plastic deformation localization. In addition, the accumulated atomic vacancy density was higher than monotonic load deformation.