TEXTURE, MICROSTRUCTURE, AND STORED ENERGY INHOMOGENEITY IN COLD-ROLLED COMMERCIAL PURITY ALUMINUM AND COPPER

Experiments on stored energy have been carried out for three types of cold rolled aluminium and copper characterised by different texture and structure. In the first type, the shear texture has been obtained in the surface layers of the examined materials rolled in one pass at a high l/h ratio (where l is the projected length of contact between roll and material, and h is the mean thickness of the sample), characterising the geometry of the rolling gap. The second type of material has been deformed through a change of the deformation path in the final pass. Calorimetric measurements were also performed on the third type of material rolled unidirectionally with medium l/h. The amount of stored energy has been found to be much less in the material with shear texture than in that with rolling texture. The observed retention of shear texture during recrystallisation may be due to inherently low energy blocks caused by the orthogonal position of the Burgers vectors in the shear orientation, which led to a lower dislocation density. A change of the deformation path decreased the stored energy.