异构金属材料及其塑性变形与应变硬化

武晓雷, 朱运田

Heterostructured Metallic Materials: Plastic Deformation and Strain Hardening

WU Xiaolei, ZHU Yuntian

图2 异构基元及其微观设计

Fig.2 Schematic of characteristic zones in a heterostructure (Upper panel: yield strength (σy), plastic strain (εp), and strain gradient (λ), all as a function of grain size. Thereinto, σy obeys the Hall-Petch relationship, while both εp and λ are of the plasticity-related size effect[28,29]. Shadow area: the maximal strain gradient and strongest strain hardening, usually in the micron range, as the criterion for the HS design[24,26,27]. Lower panel: characteristic HS zones, with a sharply contrasting (σy, εp) combination for the hard/soft zones. HB: hetero-zone boundary. NG here represents nano-grain of high-density dislocation tangles at/inside both the boundaries and interiors)