The evolution of microstructure and texture during thermomechanical processing of Al-Mg-Si-Cu alloy

摘要

In order to improve formability, it is practicable to control the texture through adjusting process parameters. This work describes the evolution of microstructure and texture during thermomechanical processing of an Al-Mg-Si-Cu alloy. With the change of deformation conditions, both the microstructure and texture change dramatically. After hot rolling from 90 mm to 7.5 mm, H and E texture components in the surface layer become dominant due to non-uniform deformation. And then with the increase of cold rolling deformation from 7.5 mm to 4.0 mm, the texture components gradually change from shear texture to typical fcc texture, i.e. Copper, S and Brass textures, and their intensities also increase. And after intermediate annealing, these texture components transform to some uncommon texture components, including {013} <001>, {001} <130>, Goss texture, {556} <110> and {111} <110> texture, not typical recrystallization texture components. Continually giving a cold rolling deformation from 4.0 mm to 1.0 mm, not only Copper, S, Brass textures, but also Goss texture due to the lower deformation can be found in the alloy sheet. A high temperature solid solution treatment can result in complete recrystallization and the formation of recrystallization texture, Cube, Goss and R texture, which results in a high formability of experimental alloy.