(1.中国科学院 金属研究所，沈阳110016；
2.中国科学技术大学 材料科学与工程学院，合肥230026)
摘 要: 为了研究铜管材游动芯头拉拔成形过程中组织结构及力学性能变化规律，采用OM和EBSD等试验方法对不同拉拔变形量的TP2管材进行分析。结果表明：经过拉拔变形后，晶粒沿着拉拔方向伸长形成纤维组织，管材显微硬度增加且轴向硬度值较高；经过第三道次拉拔变形量达到75%，晶粒沿轴向长度为80~100 μm，宽度为8~10 μm；经过拉拔变形，管材内部织构发生转变，随着变形量的提高，由原始轧制态{001}á110？、{111}á110？织构逐渐发生转动，经过三个道次后变为{110}á100？、{110}á111？织构。
关键字: 铜管拉拔；织构转变；显微组织；EBSD
（1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China）
Abstract:In order to study the changes of microstructure and mechanical properties of copper tubes during floating plug drawing process, OM and EBSD methods were used to analyze the tube with different drawing deformations. The results show that the grains were elongated along the drawing direction and form fibrous tissue after drawing, the micro-hardness of tube increases and is higher along the transverse than that along the longitudinal; after the third pass deformation amount to 75%, the grain sizes are 80-100 μm in length and 8-10 μm in width. With the deformation increasing, the type of texture transforms from {001}á110？ and {111}á110？ texture, which is formed in original rolling, into {110}á100？ and {110}á111？ texture.
Key words: tube drawing; texture transform; microstructure; EBSD method
