中國有色金屬學報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 14 No. 5 October 2004 |
during equal-channel angular pressing
GUO Cheng（郭 成）1， CHEN Jin-de（陳金德）
（1. School of Mechanical Engineering, Xi′an Jiaotong University,
Xi′an 710049, China;
2. Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China）
Abstract:Equal-channel angular pressing（ECAP） is now recognized as an effective technique for fabricating ultrafine grained materials. The results show that prevalent macroscopic shear banding occurs in ECAP as long as the pressing passes reach 2, and the severe macroscopic shear band extends from bottom to top surface and slants to the longitudinal axis of specimen at an angle of about 45°, develops at regular intervals, with a high shear strain accommodation of about 3.7 within the band. Different families of macroscopic shear bands may cut across each other, and over 60% of sample volume is occupied by macroscopic shear band when the ECAP reaches 4 passes.
Key words: equal-channel angular pressing（ECAP）; macroscopic shear banding; ultrafine grained material
