Observation of macroscopic shear band in aluminum-based alloy during equal-channel angular pressing

来源期刊：中国有色金属学报(英文版)2004年第5期

论文作者：王立忠 王经涛 郭成 陈金德

文章页码：957 - 960

Key words：equal-channel angular pressing（ECAP）; macroscopic shear banding; ultrafine grained material

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.