FORMATION OF CU-TYPE SHEAR BANDS AND THEIR INFLUENCE ON DEFORMATION AND TEXTURE OF ROLLED FCC (112)[111] SINGLE-CRYSTALS

Microstructural and textural evolution during rolling were investigate d in (112)[11 (1) over bar] single crystals of Al, Cu and homogeneous supersaturated Al1.8wt%Cu. After a rolling degree of 30% the initial C -orientation (112)[11 (1) over bar] of all three materials has rotated towards the so called D-orientation (4411)[1111 (8) over bar]. While in the non-shear banding Al the D-orientation remains stable up to hig h rolling degrees, in the shear banding materials Cu and Al-Cu it rota tes back to the initial C-orientation simultaneously with the formatio n of shear bands. This orientation change is explained by a rigid body rotation due to the special geometry of a deformation with unidirecti onal shear bands. With the onset of shear band formation also strong o rientation scatterings about the transverse direction appear in the po le figures. These scatterings are located inside the shear bands as we ll as in their vicinity. They are due to the strong shear deformation and the resulting reaction stresses occurring in the shear bands and i n their vicinity, respectively.