Role of Conjugate Slip in Deformation of Cu-10at%Al Single Crystals

Abstract

The specimens were deformed up to fracture and the dislocation structures at each stage of deformation have been observed in wide regions with a 3MV electron microscope. Results show that the conjugate slip is closely related to each stage of deformation as follows: 1) The dislocations of conjugate system are widely dispersed on the primary slip bands by the primary slip and interact with the dislocations of primary system to form the hexagonal networks. 2) The primary slip bands are successively work-hardened by the process, and then the dislocations of conjugate system gradually pile up against them. 3) The pile-up dislocations of conjugate system can move through most of the primary slip bands so that the deformation proceeds mainly by the conjugate slip at the beginning of stage III deformation. 4) The conjugate slip also causes the reactivation of sterile primary slip bands in local regions.