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

本研究以改善铝合金板材的成形性为目的，开展了微多晶织构控制和工艺条件优化研究。开发了基于取向错位理论的多尺度有限元程序，分析了板材微晶形态的塑性各向异性和塑性变形诱发的微观织构演化。为了提高板材平面各向异性小的朗克福德值(r值)，对双道次轧制工艺参数进行了优化。结果表明，与常规A6022-T43板材相比，优化织构的r值提高1.6倍，平面各向异性降低1.78倍。针对铝合金板材的弯曲回弹性能，优化了非对称轧制比和热退火时间等工艺参数。

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.