Inhomogeneity and anisotropy of microstructure and mechanical properties in severe plastic deformation processed pure copper

• Published in: Transactions of Nonferrous Metals Society of China Vol. 16; no. A02; pp. 160 - 165
• Main Author: 康锋 王经涛 杜忠泽
• Format: Journal Article
• Language: English
• Published: School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China%School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 01.09.2006
• Subjects: 力学性质; 各向异性; 多相性; 大塑性变形加工; 显微结构; equal channel angular pressing; inhomogeneity; mechanical property; microstructure; pure copper; anisotropy
• ISSN: 1003-6326

Pure copper （99.95%） square bars （32 mm×32 mm） were subjected to equal channel angular pressings （ECAP） for 4 passes at room temperature, using 90° die by route C. Optical microscopy （OM） was used to examine microstructure evolution. Small tensile specimens were sectioned by wire cutting and the mechanical properties were tested at room temperature and under the as-processed condition. The results show that significant inhomogeneity and anisotropy of microstructure and mechanical properties exist in the ECAPed material. The nearer the sample to the surface, the more inhomogeneous the microstructure is. In mechanical properties, inhomogeneity and anisotropy are ECAP pass dependent. With the higher accumulated strain resulted from high ECAP passes, the inhomogeneityand anisotropy decrease. The inhomogeneity and anisotropy can be considered to be resulted from the distributions of the strain inhomogeneity.