Microtexture, microstructure and plastic anisotropy of AA2195

The anisotropic tensile behavior of a commercial lithium-containing aluminum alloy was studied in both rolled plate and extruded forms in solution-treated and quenched and T8 tempers. Microtexture and other electron microscopy techniques were used to correlate grain orientation and morphology, load direction and inhomogeneous plastic deformation in T8 material. The ratio of yield strengths between 45 degrees and 0 degrees test directions was the same for as-quenched and T8 material. The plate and extruded materials had strong Brass, {110}[112], textures. Pronounced slip bands were found in Brass oriented grains after 45 degrees loading, on slip planes parallel to both the working direction and long axis of the grains; in a range from 0.02 to 20% average strain. An attempt to increase the area fraction of the T-1 precipitate variant on these planes had no effect on anisotropy. The intergranular fracture surfaces show coarse, linear features which suggest a connection between the planar slip bands and delamination fracture. (C) 1998 Published by Elsevier Science S.A. All rights reserved.