Influence of Compressive Deformation on Development of Dislocation Structure in a Tricrystal Model during Cyclic Deformation

Abstract

Slip deformation in tricrystal models subjected to cyclic deformation is investigated by a finite element crystal plasticity analysis code. Accumulation of geometrically necessary dislocations (GNDs) are studied in detail. Results of the analysis shown that non-uniform deformation and the high density of GNDs accumulated in the form of band around the grain boundary triple junction, this dislocation pattern formation shown that develop during increase of number of cyclic deformation and extend of development of dislocation pattern depend on the strain amplitude. Mechanism of dislocation pattern formation and extend of development of dislocation pattern are discussed from the viewpoint of influence of compressive deformation and strain amplitude on dislocation interaction of primary and secondary slip systems.