晶粒组元沿晶界旋转的铜双晶在循环变形中的滑移形貌与位错组态  

THE OBSERVATION OF SLIP MORPHOLOGY AND DISLOCATION STRUCTURE IN A FATIGUED COPPER BICRYSTAL WITH COMPONENTS ROTATING ALONG THE GRAIN BOUNDARY

作　　者：李 勇[1] 李守新[1] 李广义[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室,沈阳110016

出　　处：《金属学报》2002年第8期819-824,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金 59971058; 59931020;国家重点基础研究发展规划 G19990650资助项目

摘　　要：对晶粒组元因晶体生长时沿晶界发生旋转的铜双晶体进行了恒定塑性应变幅下的循环形变研究,塑性应变幅为1.5X10-3通过扫描电子显微镜-电子通道衬度技术（SEM-ECC）对滑移形貌和位错组态的演化进行了观察,发现由于晶粒内部的几何效应使沿晶界的位错组态随着晶粒的旋转方向的变化也相应发生变化,逐渐表现为由滑移带与晶界的相互作用过渡到形变带与晶界的相互作用.形变带Ⅱ（DB Ⅱ）对于主滑移有着明显的阻碍作用.晶界无位错区（DFZ）伴随着形变带Ⅱ在晶界的出现而产生.胞状结构的形成是由于次滑移系的开动使形变带Ⅱ中的位错墙结构先破坏而后形成.The push-pull cyclic deformation of a copper bicrystal with components rotated along the grain boundary (GB) was carried out under constant plastic strain amplitude at room temperature. The plastic strain amplitude was 1.5x 10-3. The evolution of slip morphology and dislocation structure was observed by using SEM-ECC technology. With components rotating, the dislocation structure changes gradually from the slip band to the deformation band acting with GB respectively. This phenomenon was caused by the geometrical effect of the rotating crystal planes. The second type of deformation band (DB II) blockaded the impingement of the primary slip system band. The formation of dislocation free zone (DFZ) at GB was resulted from the formation of DB II. When the secondary slip system interacted with the DB II, the wall structure of DB II turned into the cell structure gradaully.

关 键 词：循环变形 滑移形貌 铜双晶 晶界 位错组态 形变带Ⅱ 晶界无位错区 

分 类 号：TG146.11[一般工业技术—材料科学与工程] TG111.2[金属学及工艺—金属材料]