2604 単結晶の引張りに伴うSS転位パターンの発展(S18-1 組織変化と強度,S18 材料の強度と組織)

抄録

Slip deformation in mono crystal model, in which spherical shaped high dislocation density inclusion is embedded, is subjected to tensile load 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. Formation of GN dislocation structure was expected to take place depend on heterogeneous of initial dislocation density. However, results of the analysis show not only formation of GN dislocation structure but also SS dislocation structure on the primary slip system in the form of band and development of strain hardening of crystal grain is making remarkable. Mechanism of SS dislocation pattern formation are discussed from the viewpoint of effect of dislocation interaction and disclination type deformation field.