金属材料的晶界塑性变形机制

王江伟, 陈映彬, 祝祺, 洪哲, 张泽

Grain Boundary Dominated Plasticity in Metallic Materials

WANG Jiangwei, CHEN Yingbin, ZHU Qi, HONG Zhe, ZHANG Ze

图6 倾转晶界迁移的理论模型[34,38,67,70]

Fig.6 Theoretical model of tilt grain boundary migration (a) Cahn model of symmetric and asymmetric grain boundary migration[67] ( m —the motion direction of grain boundary defects; the latter case involves the cooperative gliding of two sets of dislocation families of Burgers vectors b 1 and b 2) (b) pure shuffling model[34] (circles—atomic rearrangement) (c) discrete shear complete dislocation model[70] ( bDSC—Burgers vector of secondary discrete shear complete edge dislocation) (d) shear complete dislocation model (SMIG) model[38] ( bDisc—Burgers vector of GB dislocation step, i.e. disconnection)