Virtual Characterization of the mechanical properties of aluminum alloys at elevated temperatures

几十年来，大规模削减一直是汽车行业提高燃油经济性的优先事项。许多制造商选择用典型的钢部件代替较轻的铝合金。这项研究中特别感兴趣的一个应用**是在面板组件中使用5xxx系列铝镁合金板材。在更换面板部件方面，铝板的困难在于其在室温下的可成形性低于钢材。此外，由于铝镁薄板合金的L线和锯齿状流动行为(动态应变**时效/PLC效应)，在室温下**成形零件的表面质量是不理想的。热变形加工是工业中理想的成形方法，因为它能够**细化显微组织，这会显著影响机械响应并提高成形性。**提高温度成形对应于降低流动应力和提高板材的延展性，这**可以在不修改设计的情况下在板材中进行深拉深和拉伸。利用晶体塑性理论进行的虚拟材料(VMC)表征是一种非常强大的工具，它可以**表征材料在不同温度和应变路径下的力学性能，而只需**实验成本和时间的一小部分。在本项目中，VMC被用来预测5083铝合金在500oC下的力学各向异性。

For decades, mass reduction has been a priority in the automotive sector for improving fuel economy. Many**manufacturers have opted for substituting typical steel components for lighter aluminum alloys. An application**of particular interest in this study is the use of 5xxx series aluminum-magnesium sheet alloys in panel**components. The difficulty with aluminum sheet, in the replacement of panel components, is the lower**formability at room temperatures than in steels. In addition, surface quality of formed parts at room temperature**is undesirable due to the Lüder's lines and serrated flow behaviour of Al-Mg sheet alloys (dynamic strain**aging/PLC effect). Hot deformation processing is a desirable method for shaping in industry due to the ability**to refine microstructure, which significantly influences the mechanical response and can increase formability.**Elevated temperature forming corresponds to a decreased flow stress and increased ductility of the sheet, which**can allow deep drawing and stretch in panels competitive with steels without design modifications. Virtual**material (VMC) characterization, performed with crystal plasticity theory, is a very powerful tool that can**characterize the mechanical properties of a material, at various temperatures and strain paths, with a fraction of**the cost and time of experiments. In this project, VMC is used to predict the mechanical anisotropy of the**aluminum alloy 5083 at 500oC.