Overview No. 76: Mechanism of deformation and development of rolling textures in polycrystalline f.c.c. Metals—III. The influence of slip inhomogeneities and twinning

Abstract

The influence of inhomogeneous deformation modes on the formation of cold-rolling textures in f.c.c. materials of different stacking fault energy has been deduced by comparing measured ODFs with those predicted by homogeneous slip, i.e. Taylor-type theories, presented in Part II. The pattern of texture development is influenced by microscoptructual inhomogeneities. Deformation bands are observed in all materials and increase the scattering of the textures. In medium SFE materials such as Cu microbands and copper-type shear bands produce further scattering. In low SFE materials such as α brass, twinning followed by shear banding and the subsequent process of normal slip in the extremely fine deformed microstructure lead to a completely different development of texture. By means of quantitative ODF analysis this texture transition and the underlying mechanisms have been investigated in great detail. It seems probable that twinning occurs also in copper at very high rolling strains. New texture data for the alloy systems CuAl, CuGe and CuP are briefly presented and the effects of SFE on rolling textures are derived.