Mechanism of {111} recrystallization texture evolution in aluminum alloy sheets fabricated by symmetric/asymmetric combined rolling process

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In order to improve r-values and acheve good deep drawability in an age-hardenable Al-Mg-Si alloy for automotive body panels, symmetric cold-rolling and asymmetric warm-rolling were conducted under appropreate conditions, and then the mechanism of recrystallization texture evolution was investigated with the purpose of developing the {111} texture favorable for r-value improvement during solution treatment.The {111} recrystallization texture was formed during the solution treatment under high-temperature and short-time of the rolled sheets, which were processed by asymmetric warm-rolling at a low reduction in thickness after cold-rolling. Microstructural observations and orientation analyses suggested that the {111}-oriented subgrains, which had low dislocation density and was hardly subjected to pinning by fine precipitates, became recrystallized nuclei preferentially and encroached on areas with other orientations, resulting in the {111} texture evolution.