Dislocation structures on the plane of shear in compressed double-notch copper single crystal specimens

Dislocation structures in the zone of shear of double-notch copper single c rystals, generated by a shear stress 20 MPa acting in the specimen axis ([1 10] direction) at 773 K were investigated by means of transmission electron microscopy. Dislocation configurations in different crystal planes of shea r, (1 (1) over bar 1), (1 (1) over bar 3), (1 (1) over bar 0) and (001), we re compared. The role of the [110] {111} slip systems in the process of she ar is assessed and possible indications of a direct glide of dislocations w ith Burgers vector b = a/2[110] in the mentioned compact and non-compact pl anes are presented. (C) 1999 Elsevier Science S.A. All rights reserved.