G031051 Generation of Statistically Stored Dislocation Patterns in a Tri-crystal Model during Cyclic Deformation

Abstract

Slip deformation in tri-crystal models subjected to cyclic deformation is investigated by a finite element crystal plasticity analysis code. Accumulation of geometrically necessary dislocations (GNDs) and statistically stored dislocations (SSDs) are studied in detail. Results of the analysis showed that the high density of GNDs and SSDs accumulated in the form of band around the grain boundary triple junction, and dislocation pattern are developed during cyclic deformation. Mechanism of dislocation pattern formation is discussed from the viewpoint of dislocation interaction between primary and secondary slip systems.