γ/γ'の格子ミスフィットに起因した転位挙動 : 離散転位動力学法による検討(J08-3 転位・変形,J08 原子系の計算力学シミュレーション)

Abstract

In the present study, a DDD-FEM analysis is conducted on the dislocation behavior in the γ/γ' microstructure of Ni-based superalloys. Tensile/compressive stress is applied on the γ' precipitates in the FEM, in order to clarify the effect of internal stress due to the lattice misfit. The dislocation approaching the γ' precipitate is decelerated by the negative stress of γ', while that is accelerated by the positive stress. Detail observation on the distribution of shear stress suggests that the stress becomes negative near the γ/γ' interface, resulting in the repalsive force on the approaching dislocation.