(1. 燕山大学 材料科学与工程学院， 秦皇岛 066004；
2. 清华大学 材料系， 北京 100084)
摘 要: 利用TEM分析拉伸变形多晶铜中不同取向晶粒的位错组织，研究了多晶与单晶形变行为的相关性。结果发现，多晶铜中诸晶粒的形变显微组织可分为3种不同类型，而且组织类型与其相应晶粒的晶体学取向存在密切的相关性；根据多晶中不同类型组织的体积含量，结合相应取向单晶的应力-应变曲线，计算出了多晶的应力-应变曲线，其结果与实测曲线相似。
关键字: 位错组织； 晶粒取向； 应力-应变曲线
between polycrystalline and single crystal copper
（1. College of Materials Science & Engineering,
Yanshan University, Qinghuadao 066004, P.R.China;
2. Department of Materials Science & Engineering,
Tsinghua University, Beijing 100084, P.R.China）
Abstract:The dislocation microstructure was analyzed by TEM for grains of different orientations in polycrystalline copper during tensile deformation, and also the correlation of plastic deformation behavior between polycrystalline and single crystal copper was studied. The results show that three types of microstructure have been identified in polycrystalline copper after deformation. Meanwhile, an obvious correlation is found between microstructure and grain orientation. The stress-strain curve of the polycrystal is calculated with fair accuracy from single crystal data, which are weighted according to the volume fraction of the three different types of microstructure, and a good match with the experimental curve has been obtained.
Key words: dislocation microstructure; grain orientation; stress-strain curve
