图1. 大塑性变形的工艺示意图:高压扭转、等通道转角挤压、累积叠轧
Fig.1. Schematic illustrations of severe plastic defor-mation process(a) high pressure torsion (P—pressure)(b) equal channel angular extrusion (R—outer angular radius, Φ—inner corner angle, ψ—outer corner angle)(c) accumulative roll bonding