Texture Evolution in Pure Copper Processed by Equal Channel Angular Extrusion with Extended Processing Routes
An experimental characterization of texture evolution during equal channel angular extrusion (ECAE) of pure copper was conducted up to 8 passes considering an extended range of processing routes. These routes are featured by 0°, 45°, 90°, 135°, and 180° rotation about the billet longitudinal axis after each pass, and were designated as R0, R45, R90, R135, and R180, respectively. They were implemented using new die designs with the cross-section of the die channels as a 24-sided regular convex polygon and with die angle (φ) of 90° and 120°, respectively. X-ray diffraction measurements show that for both die sets, the textures developed via the different routes all show orientation concentrations along fibers with the 111 planes parallel to the macroscopic simple shear plane and <110> directions parallel to the macroscopic simple shear direction, yet the locations and orientation densities of the main texture components vary significantly with the pass number and the processing route. After 4 to 8 passes, the texture is found to be the weakest via route R180 for both die sets, and strongest via RO or R45. For a given route and pass number, the texture developed with φ=120° is generally weaker than its counterpart with Φ=90°. These results thus confirm the general tendencies of texture development in face-centered cubic metals with lll<110> slip as the dominant deformation mechanisms, albeit in a wide range of processing route or deformation history.
Saiyi Li Hao Li
School of Materials Science and Engineering,Central South University,Changsha 410083,China School of Materials Science and Engineering,Central South University,Changsha 410083,China Guangdong
国际会议
5th International Conference on Nanomaterials by Severe Plastic Deformation(第五届剧烈塑性变形纳米材料国际会议)
南京
英文
271-276
2011-03-01（万方平台首次上网日期，不代表论文的发表时间）