Microbands in 80% Drawn Copper Single Crystals With <111> and <100> Starting Orientations

Copper single crystals with the startingorientations and were drawn 80%. In thecore region of the rods the orientations and themicrostructures were investigated. The stable crystal had a structure consisting of equiaxed cellsand microbands which were formed parallel to the{111} planes with the exception of the {111} planein the cross section of the rod. The orientationwas not entirely stable; the beginning ofsome orientational changes was observed at a highdegree of deformation. In the parts with stableorientation a cylindrical cell structure was foundwith the long axes parallel to the drawing direction.Single microbands formed locally. Dislocationtangles around them finally developed, whichlead to a change of the orientation.