Controlling of texture and microstructure during asymmetrical cold rolling and subsequent annealing in aluminum alloys

Asymmetrical cold rolling was carried out in AA 5052 sheets with different velocities of upper and lower rolls. In order to study the major factors governing the formation of texture during asymmetrical rolling, the velocity ratio of upper and lower rolls was varied. The strain states associated with asymmetrical rolling were derived from simulations with the finite element method. It turned out that the evolution of deformation textures in asymmetrically rolled sample strongly depended on the strain history along the stream lines throughout the thickness layers of the rolled sample. Upon annealing, the evolution of recrystallized microstructure and annealing texture strongly depended on the cold rolled microstructure and texture. Randomization of recrystallization texture was obtained in the thickness layers where shear textures developed during asymmetrical cold rolling. The refinement of grains was obtained in the thickness layers being subjected to a large amount of effective strain during asymmetrical rolling.