Analysis of deformation textures of asymmetrically rolled aluminum sheets

dAbstract-Asymmetric rolling, in which the circumferential velocities of working rolls are different, imposes shear deformation and in turn shear deformation textures to sheets through the thickness. A component of ND//< 111 > in the shear deformation textures can improve the plastic strain ratios of aluminum sheets. In order to understand the evolution of NDH(III), the strain histories and distributions in the sheets and the texture evolution during the asymmetric rolling have been measured and calculated. The shear deformation texture can vary with the ratio of shear to normal strain increments. As the ratio increases from zero to infinity, the texture moves from the plane strain compression texture (beta fiber) to the ideal shear deformation texture consisting of {001} < 110 >, {111} < 110 >, and {111}< 112 >. The ratio increases with rolling reduction per pass in asymmetric rolling. However, it is practically difficult to develop a rolling reduction per pass high enough to obtain the ideal shear deformation texture. Imposing the positive and negative shear deformations on the sheet by reversal of the shearing direction can give rise to the ideal shear deformation texture. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.