The Instability of the Work Hardened State. II. Slip in “Alien” Dislocation Distributions

The mechanism of slip in copper crystals with extraneously deformed surfaces was investigated using an etch pit technique. Some suggestions are made as to the deformation of crystals with hard surface layers. Slip in crystals oriented for multiple glide and in polycrystals is also discussed. Experiments of the latent hardening type were carried out on copper crystals by altering the slip system during the course of deformation. Phenomena characteristic of slip in alien dislocation distributions were observed when the slip plane was changed but not when only the slip direction was altered. The stability of Stage II dislocation distributions is discussed in the light of these experiments. It is concluded that the character of slip in Stage II is determined by the geometry of the dislocation distribution.