Evolution of shear texture during the asymmetric rolling and its annealing behavior in a twin-roll casting AA6016 sheet: an ex-situ electron backscatter diffraction study
Xianwei Ren, Xieyi Zhang, Yuanchun Huang, Yu Liu, Likai Zhao, Wenlong Zhou
Abstract
To better understand the enhanced formability of Al–Mg–Si alloy automotive outer panels by introducing shear texture F{111}<112> orientations, we investigate the shear texture evolution of a twin-roll casting AA6016 sheet with an initial R-cube and E texture during asymmetric rolling (ASR). The macro-textures of the sheet with a deformation of 30%, 50%, and 85% are studied using X-ray diffraction. Results show that the initial R-cube evolved to Dillamore/copper with the increase in strain, whereas the initial E texture is weakened accompanying the enhancement of the F texture during ASR. Moreover, the local recrystallization textures are analyzed using the sheet that has been annealed at 330 °C at different times via the ex-situ electron backscatter diffraction. The F texture is dominant for the ASR sheet, which could be attributed to the rapid nucleation and grain growth of grains with F orientation (F-grains). Furthermore, the spatial relationship at 19.7° [1¯10] between the grain with copper orientation and F-grains is another important reason to promote the F orientation development. Finally, the formability of the ASR sheet is found to significantly improve.