剧烈塑性变形对块体纳米金属材料结构和力学性能的影响*

倪颂, 廖晓舟, 朱运田

EFFECT OF SEVERE PLASTIC DEFORMATION ON THE STRUCTURE AND MECHANICAL PROPERTIES OF BULK NANOCRYSTALLINE METALS

NI Song, LIAO Xiaozhou, ZHU Yuntian

表1 原始样品及不同变形阶段样品的位错密度和平均晶粒尺寸[22]

Deformation stage Equivalent strain Dislocation density / m-2 Average grain size / nm As-deposited 0 2.2 × 1015 21 I 0~4.5 3.6 × 1015 22 II 4.5~20 5.8 × 1015 30 III 20~35 4.1 × 1015 35 IV 35~182 6.0 × 1015 50 V 180~340 2.1 × 1015 72 VI 340~550 2.0 × 1015 120