環境温度変化を考慮した転位-結晶塑性モデルおよびMulti-phase-fieldモデルに基づくLPSO型Mg二相合金の強化機構に対する検討

抄録

In this study, we carry out dynamic recrystallization (DRX) analysis for Mg/LPSO alloys based on dislocation-based-crystal plasticity and multi-phase-field (MPF) models considering change in environmental temperature to reproduce temperature dependence of the strengthening mechanism: the kink deformation of LPSO phase and the grain refinement of α-Mg phase in the vicinity of LPSO phase due to DRX. We introduce some thermal effects into the critical resolved shear stress (CRSS) and the dislocation mobility in dislocation-based crystal plasticity model, and into the nucleation condition in MPF model. The results obtained here show that the grain refinement and work hardening occur depending on environmental temperature through the interaction between deformation and recrystallization.