垂直晶界钢双晶体的循环形变行为  

CYCLIC DEFORMATION BEHAVIOR OF A COPPER BICRYSTAL WITH A PERPENDICULAR GRAIN BOUNDARY

作　　者：张哲峰[1] 王中光[1] 苏会和[1] 

机构地区：[1]中国科学院金属研究所材料疲劳与断裂国家重点实验室,沈阳110015

出　　处：《金属学报》1998年第8期841-846,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金!19392300-4

摘　　要：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.

关 键 词：铜双晶体 循环形变 CSS曲线 滑移形貌 位错组态 

分 类 号：TG111[金属学及工艺—物理冶金] TG146.11[金属学及工艺—金属学]