中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 8 August 2012 |
（1. School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China;
2. National Engineering Research Center for Light Alloy Net Forming,
Shanghai Jiao Tong University, Shanghai 200240, China;
3. Department of Materials Science and Engineering,
Norwegian University of Science and Technology, NO-7491, Trondheim, Norway）
Abstract:Finite element method was used to study the strain distribution in ZK60 Mg alloy during multi-pass cyclic extrusion and compression (CEC). In order to optimize the CEC processing, the effects of friction condition and die geometry on the distribution of total equivalent plastic strain were investigated. The results show that the strain distributions in the workpieces are inhomogeneous after CEC deformation. The strains of the both ends of the workpieces are lower than that of the center region. The process parameters have significant effects on the strain distribution. The friction between die and workpiece is detrimental to strain homogeneity, thus the friction should be decreased. In order to improve the strain homogeneity, a large corner radius and a low extrusion angle should be used.
Key words: cyclic extrusion and compression; finite element method; friction; ZK60 magnesium alloy; strain homogeneity
