Process Metallurgy Analyses for New Al Alloy Sheet Metal Generation based on Misorientation Theory

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In this study, to improve formability of aluminum (Al) alloy sheet metal, micro-ploycrystal texture control and optimization of process conditions were performed. We develop a multi-scale finite element procedure based on misorientation theory, both plastic anisotropy of sheet metal by micro-crystal morphology and plastic deformation-induced micro-texture evolution were analyzed. In order to improve the Lankford value (r-value) with small planar anisotropy of sheet metal, parameters of 2-path rolling processes were optimized. As the results, it was confirmed that the optimum texture has 1.6 times higher r-value and 1.78 times lower planar anisotropy compared with conventional A6022-T43 sheet metal. In the bendability and springback property of Al sheet metal, parameters of asymmetric rolling ratio and heat annealing time were optimized.