Influence of temperature on hot rolling textures of aluminium alloys in absence of recrystallisation

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During thermomechanical processing of aluminium alloy sheets, a strong anisotropy develops resulting from the presence of preferred orientations in the metal due to hot and cold deformation and recrystallisation. To date, little attention has been paid to the formation of deformation textures during hot rolling in the absence of recrystallisation. Some results obtained on two different aluminium alloys having high stacking fault energy are presented. Textures measured after hot and cold rolling, starting from the same initial texture, are analysed in detail. By contrast with other work, it is first shown that the starting textures are neither random nor orthotropic and it is demonstrated that assuming orthotropic symmetry can lead to somewhat erroneous conclusions. The principal results of the texture analysis are: the texture strength increases with increasing temperature; the orientations are more uniformly distributed along the β fibre after hot rolling than after cold rolling; and there is a significant increase of the brass component with increasing temperature. None of the actual texture predictions is in complete agreement with all these experimental observations.MST/1284