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 crystals, generated by a shear stress 20 MPa acting in the specimen axis ([110] direction) at 773 K were investigated by means of transmission electron microscopy. Dislocation configurations in different crystal planes of shear, (11̄1), (11̄3), (11̄0) and (001), were compared. The role of the 〈110〉{111} slip systems in the process of shear is assessed and possible indications of a direct glide of dislocations with Burgers vector b=a/2[110] in the mentioned compact and non-compact planes are presented.