分散強化合金中の硬質粒子近傍に生ずる変形と巨視的な力学特性の結晶塑性解析

抄録

Multiple slip deformation in dispersion hardening alloys are numerically analyzed by using a crystal plasticity finite element technique the characteristics of macroscopic strain hardening are discussed. Strain hardening in each of slip system estimated by the density of statistically stored dislocations (SSDs). The increment in the SSD density was evaluated with the value of slip strain and the dislocation mean free path. It was found show that the strain hardening ratio was overestimated with experimental one when the critical resolved shear stress (CRSS) and dislocation mean free paths for secondary systems was chosen as the same scale dependency with those for the primary one. The reason for the over estimation is due to excessive activity of the secondary slip systems. The values CRSS of secondary systems are given by higher than the primary one. The results show strain hardening ratio is in good agreement with experimental one.