FORMATION OF Cu-TYPE SHEAR BANDS AND THEIR INFLUENCE ON DEFORMATION AND TEXTURE OF ROLLED f.c.c. {112} < 111 > SINGLE CRYSTALS

摘要

Microstructural and textural evolution during rolling were investigated in (112)[111] single crystals of Al, Cu and homogeneous supersaturated All.8wt%Cu. After a rolling degree of 30% the initial C-orientation (112) [111] of all three materials has rotated towards the so called D-orientation (4 411)[11 118]. While in the non-shear banding Al the D-orientation remains stable up to high rolling degrees, in the shear banding materials Cu and Al-Cu it rotates back to the initial C-orientation simultaneously with the formation of shear bands. This orientation change is explained by a rigid body rotation due to the special geometry of a deformation with unidirectional shear bands. With the onset of shear band formation also strong orientation scatterings about the transverse direction appear in the pole figures. These scatterings are located inside the shear bands as well as in their vicinity. They are due to the strong shear deformation and the resulting reaction stresses occurring in the shear bands and in their vicinity, respectively.