Changes in microstructure during the tensile plastic deformation of strongly cube-textured AA5005 at 250C was studied as a function of strains ranging from 0.1 to 0.5. Attention was focused upon the evaluation of the misorientation angles across dislocation boundaries which were classified, as being either geometrically necessary or incidental, according to theoretical concepts. It was found that geometrically necessary boundaries gradually developed a marked hierarchical character, and that the corresponding mean misorientation angles were significantly higher than those across incidental dislocation boundaries. They also increased rapidly during straining, as in the case of cold deformation. On the other hand, the mean misorientations across incidental dislocation boundaries remained almost constant within the strain interval that was used. This contrasted with a reported slow increase.

P.Cizek, B.P.Wynne, B.A.Parker: Scripta Materialia, 1996, 35[10], 1129-34