Abstract
Influence of large slip deformation with overloading on the following slip deformation behavior under the cyclic deformation is investigated by a finite element crystal plasticity analysis code. Accumulation of geometrically necessary dislocations (GNDs) and statically stored dislocations (SSDs) with non-uniform deformation around the grain boundary triple junction of tri-crystal models subjected to cyclic deformation are studied in detail. Results of the analysis shown that non-uniform deformation and the high density of GNDs and SSDs accumulated around the grain boundary triple junction with overloading, after unloading, these dislocation density are decreased and dislocation patterns are attenuated. However, attenuated dislocation patterns are without disappearing and remain when average tensile stress and strain of tri-crystal models are 0, and develop non-uniform deformation and accumulation of dislocation in the following cyclic deformation. Mechanism of the residual dislocation develop non-uniform deformation in the following cyclic deformation are discussed from the viewpoint of disclination type deformation around the grain boundary triple junction of tri-crystal models.
