金属材料的构型化复合与强韧化

范根莲, 郭峙岐, 谭占秋, 李志强

Architecture Design Strategies and Strengthening-Toughening Mechanisms of Metal Matrix Composites

FAN Genlian, GUO Zhiqi, TAN Zhanqiu, LI Zhiqiang

图3 基于IAZ理论和弹塑性断裂力学的基体双峰异构晶区匹配优化[60,61]

Fig.3 Structure optimization of bimodal grain architecture based on interface affected zone (IAZ) theory and elastoplastic fracture mechanics (a-c) bimodal microstructure of CNT/5083Al (a); best strength and ductility combination is obtained when the size of the coarse-grain (CG) zone approaches to about double of that of IAZ (b, c)[60] (d-f) bimodal microstructure of CNT/2009Al (d), and schematic of toughening mechanism in heterogeneous materials: stress concentration at the micro-crack tip induced plastic zone in coarse grain and crack blunting by joint action of multiple neighboring coarse grains when the size of the course-grain zone is close to that of the plastic zone (e-f)[61] (DZ—ductile zone, BZ—brittle zone, R0—size of the plastic deformation zone, a—half length of the crack, SC—stress concentration)