Influence of symmetric and asymmetric rolling on texture evolution of work-hardened AA 5xxx aluminium alloy  

对称和不对称轧制对加工硬化AA 5xxx铝合金织构演化的影响

作　　者：MatjažGODEC Stefan ZAEFFERER Jakob KRANER Črtomir DONIK Irena PAULIN 

机构地区：[1]Institute of Metals and Technology,Lepi pot 11,1000,Ljubljana,Slovenia [2]Max-Planck-Institut für Eisenforschung,Max-Planck-Strasse 1,40237 Düsseldorf,Germany [3]Impol 2000 d.d.,Partizanska cesta 38,2310 Slovenska Bistrica,Slovenia

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第1期30-44,共15页中国有色金属学报(英文版)

摘　　要：The textures and microstructures of hot-and cold-rolled sheets of an AA 5454 aluminium alloy were studied,with special attention paid to comparing the texture development for the symmetric and asymmetric cold rolling.Scanning electron microscopy with electron-backscatter diffraction was used to monitor the development of the microstructure in the differently deformed and additionally annealed samples.Details of the formations and transformations of individual texture components occurring during the rolling processes were observed and discussed.The average grain sizes,textures and mechanical properties were correlated and explained for the symmetric and asymmetric cold-rolled samples.The asymmetric rolling is beneficial in terms of deep drawability because it reduces the planar anisotropy of the annealed material due to the decrease of the Cube,Goss,rotated-Cube and η-fibre texture components and at the same time strengthens X1-and X2-fibre texture components which are shear texture components and improve deep drawability.During the asymmetric cold rolling,the temperature increases due to friction,triggering recrystallisation processes and leading to larger grains.It is also confirmed that asymmetric cold rolling uses less rolling force and consequently less energy to produce a final material with better formability,particularly earing.研究了热轧和冷轧AA 5454铝合金板材的织构和显微组织,特别比较了对称和不对称冷轧过程中织构的发展。采用扫描电子显微镜结合电子背散射衍射技术监测不同变形方式及退火样品的显微组织演变。观察并讨论了轧制过程中单个织构组分的形成和转变。解释了对称和不对称冷轧样品的平均晶粒尺寸、织构和力学性能的相互关系。由于不对称轧制能够减少立方、高斯、旋转立方和η纤维等织构组分,从而降低退火材料的平面各向异性,因此有利于提高深冲性能。同时,不对称轧制还能够增强X1和X2纤维状剪切织构组分,从而提高深冲性能。在不对称冷轧过程中,由于摩擦导致温度升高,引发再结晶,导致晶粒长大。研究证实不对称冷轧所需的轧制力更小,因而能够消耗更少的能量生产出具有更好成形性、尤其是更小制耳的最终材料。

关 键 词：crystallographic texture EBSD aluminium alloy symmetric/asymmetric rolling ANISOTROPY 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG339[金属学及工艺—金属材料]