DISLOCATION MICROSTRUCTURE AND TEXTURE DEVELOPMENT IN ROLLED COPPER SINGLE-CRYSTALS

Copper single crystals within initial orientations (110)[112BAR], (110 )[001], (113BAR)[741], (100)[011] and (100)[001] were rolled up to 95 % reduction. Optical and electron metallography as well as crystallogr aphic texture measurements were performed. Strain distributions in sli p systems were also completed. The dislocations formed banded structur es. Directions of dislocation bands depended on the amount of deformat ion and on the distribution of strains in the slip planes. Deformation bands, transition bands and shear bands were formed in crystals with unstable orientations. For shear bands to occur the activation of new slip systems, non-coplanar with the formerly operating, as well as for mation of the well-defined banded structure was required.