G0310101 Influence of Strain Amplitude on Dislocation Patterns Formation in a Tricrystal 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 shown that non-uniform deformation and the high density of GNDs accumulated in the form of band around the grain boundary triple junction, SSDs accumulated in the form of band during cyclic deformation. Mechanism of dislocation pattern formation is discussed from the viewpoint of influence of strain and stress amplitude.