The reduction of planar anisotropy by texture modification through asymmetric rolling and annealing in AA5754

Abstract

Asymmetric rolling (ASR) was applied to aluminum alloy AA5754 under various processing conditions. The deformation texture and the texture after subsequent recrystallization were studied by X-ray diffraction and electron back scattering diffraction (EBSD) in a scanning electron microscope (SEM). After unidirectional ASR, the deformation texture was rotated by around 10° about the transverse direction from the f.c.c. plane strain compression texture (β-fibre texture), whereas it was close to the ideal β-fibre texture after reverse-ASR. The recrystallization texture was randomised with a reduced cube {0 0 1}〈1 0 0〉 component, and the randomising effect is more prominent under high velocity ratio between the upper and lower rolls and reverse rolling conditions. Based on crystal plasticity theory calculations and measurements of cup earing profiles, the sheet planar anisotropy is predicted to decrease after ASR and annealing, but the mean r-value is not enhanced.