本文通过对取向近垂直晶界铜双晶体进行塑性应变控制循环变形，在表面滑移形貌及饱和位错组态观察的基础上，研究了其循环应力－应变响应．结果表明该铜双晶体循环应力－应变（CSS）曲线具有两个饱和轴向应力基本不变的平台区．即在塑性应变范围1．80×10-4－1．35×10-3对应于饱和应力幅62—64MPa及在塑性应变范围2．04×10-3—2．56×10-3对应于饱和应力幅70—71MPa．讨论了组元晶体的相对取向对其滑移形貌、饱和位错组态及CSS曲线的影响。
Based on the observations of slip patterns and saturation dislocation patterns,the cyclic stress-strain response was investigated by cyclically loading a copper bicrystal with a grain boundary perpendicular to the stress axis under constant plastic strain control. The results showed that the cyclic stress-strain (CSS) curve displayed a double plateau region in the plastic strain range of 1.80 × 10-4 － 2.56 × 10-3. The plateau saturation axial stresses were 62 - 64 MPa and 70 - 71 MPa respectively at axial plastic strain range of 1.80× 10-4－ 1.35× 10-3 and 2.04× 10-3 － 2.56× 10-3. The effects of component crystal orientation on the slip characteristics, saturation dislocation patterns and CSS curve were discussed.
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