Density evolution of atomic vacancies in HCP metal single crystals subjected to cyclic loading

Abstract

Density evolution of atomic vacancies in hexagonal close packed (HCP) metal single crystals subjected to cyclic loading is numerically evaluated by using a crystal plasticity software code. Slip deformation is evaluated by dislocation density-based models and generation rate of atomic vacancies is given by the model proposed by Essmann and Mughrabi (1979). Cyclic stress-strain curve, evolutions of plastic work density, SS dislocation density and atomic vacancy density are shown. It is emphasized that the atomic vacancy density does not show a linear dependence on the plastic work density or accumulated plastic strain.