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7 晶界阶错的原子尺度动力学行为[7,28]

Fig.7 Atomic-scale dynamics of grain boundary disconnections (a-c) nucleation mechanism of grain boundary disconnections: (a) free surface nucleation of Σ11(113) grain boundary disconnections in Au bicrystals[28]; (b) triple junction nucleation in Au nanocrystalline metals[28] (TB—twin boundary); (c) homogeneous nucleation of disconnections in Σ5(013) grain boundary in Cu bicrystals[7] (Inset shows the atomic structure of the disconnection in the region marked out by the rectangle) (d, e) propagation of single-layer (d) and double-layer (e) disconnections and coupled grain boundary migration under shear loading[28] (f-h) dynamic coalescence and decomposition of grain boundary disconnections[28]