Influence of crystallographic orientation on the void growth at the grain boundaries in bi-crystals

Void growth and morphology evolution in fcc bi-crystals are investigated using crystal plasticity finite element method. For that purpose, representative volume of with a void at the grain boundary considered analysis. Grain is assumed initially perpendicular/coaxial straight sides cell. Fully periodic conditions prescribed macroscopic stress triaxiality Lode parameter kept constant during whole deformation process. Three different pairs orientations characterized as hard-hard, soft-soft soft-hard have been employed for modelling mechanical response bi-crystal. Simulations performed to study implications triaxiality, crystallographic orientation on slip mechanism, hardening hence evolution. The impact presence its heterogeneity lattice rotation resulting fragmentation neighbouring areas also analysed discussed.