(合肥工业大学 材料科学与工程学院，合肥 230009)
摘 要: 运用有限元模拟软件Msc.Marc对纯铜挤扭工艺变形特征进行研究，分析挤扭变形过程中应变分布以及应变分量的变化趋势。采用自行设计的挤扭模具，在室温下进行了纯铜的一道次挤扭试验。结果表明：变形可分为变形开始、完全充满、逐步挤出3个阶段；应变呈中心低、边缘高的分布；变形过程中正应变分量小，切应变分量较大，变形以剪切变形为主。挤扭过程中存在滑移和孪生两种变形方式；挤扭后试样的硬度得到显著提高，在横截面呈现边缘高、中心低的分布趋势。
关键字: 纯铜；挤扭变形；数值模拟；显微组织；显微硬度
pure copper by twist extrusion
（School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China）
Abstract:The finite element simulation about pure copper deformation during twist extrusion (TE) was carried out by the simulation software MSC.Marc, the procedure steps of TE, the distribution of effective strain and the change of strain component were analyzed. The experiment about pure copper at room temperature during TE was carried out using this own die. The results show that the TE deformation can be divided into there steps. The value of the effective strain in the edge area is much larger than that of the center area. The value of the normal strain is extraordinary small, while the shear strain is relative large. There are slipping and twining during the TE process. The hardness of sample significantly increase, the hardness in the edge area is visibly larger than that in the center.
Key words: pure Cu; twist extrusion deformation; numerical simulation; microstructure; microhardness
