Macroscopic and Microscopic Studies of the Plastic Deformation of Copper Single Crystals during Strain-Rate Changes II. Active Slip Volume and Density of Mobile Dislocations

Prom a quantitative analysis of cinematographic films of the development of slip lines the change in the active crystal length l(a) during different strain rate changes at different temperatures and work hardening stages is obtained. This result is used to separate the variation of the active dislocation length l(a) rho(b) (Part I) into the variation of the active crystal length l(a) (proportional to the active slip volume nu(a)) and the mobile dislocation density rho(b) within nu(a). The resulting dependences are discussed in terms of a spectrum of source regions in the crystal and of dislocation multiplication within these active regions.