Development of a magnesium alloy sheet with enhanced formability for vehicle lightweighting

镁合金密度低，比刚度高，为汽车提供了极大的可能性。 轻便。与它们的使用相关的问题之一是它们在室温下的低成形性。在… 在较高的温度下，由于激活了额外的滑移系统，其成形性得到了改善。然而， 在高温下成形需要额外的工具和能源成本，并延长周期时间。 改善镁合金成形性的另一个途径是控制其织构和显微组织。一种随机的纹理， 以及细晶，导致孪晶的减少和成形性的增加。通常情况下，更随机 织构是通过添加稀土元素(REE)作为合金元素来获得的。然而，这些 元素价格昂贵，而且与其生产相关的许多环境和健康问题， 加工、利用。近年来，非对称轧制被作为一种生产细小材料的方法进行了研究 各种金属板材的显微组织。在这个过程中，顶部和顶部之间的速度差异 下辊产生的剪应力促进了再结晶，从而生产出更细小的板材。 谷物。使用该工艺生产的板材具有更好的成形性和良好的机械性能。在这 本课题将对非对称轧制镁合金板材的成形性进行研究。两个常见的 将使用合金(AZ31和ZEK100)作为基准，并与将开发的一种新合金进行比较。 这种新合金是由德国合作伙伴开发的，目的是向汽车行业提供 具有更好的成形性和力学性能的轻合金(铝在 合金)。在这个项目中进行的成形性研究将使我们的加拿大工业合作伙伴能够评估 基准镁合金板材以及新合金板材在生产中的潜在用途 在室温和中等温度(高达250°C)下冲压汽车零件。与 对轻量化汽车部件、新材料和新技术研究项目的需求不断增长 对于我们的行业来说，在这个竞争激烈的市场中保持领导地位是强制性的。

With their low density and high specific stiffness, magnesium alloys offer great possibilities for vehicle lightweighting. One of the issues associated with their use is their low formability at room temperature. At higher temperatures, their formability is improved due to the activation of additional slip systems. However, forming at high temperatures involves additional tooling and energy costs and lengthens the cycle time. Another way to improve magnesium formability is to control its texture and microstructure. A random texture, as well as fine grains, lead to a reduction of twinning and an increase in formabilty. Typically, more random textures are obtained by the addition of rare earths elements (REEs) as alloying elements. However, these elements are costly and there are many environmental and health issues associated to their production, processing, and utilization. Recently, asymmetric rolling has been studied as a way to produce fine microstructures in various metal sheets. During this process, the difference in speed between the top and bottom rollers induces shear stresses that promote recrystallization, therefore producing sheets with finer grains. Sheets produced using this process show improved formability and good mechanical properties. In this project, the formability of magnesium sheets produced by asymmetric rolling will be studied. Two common alloys (AZ31 and ZEK100) will be used as a baseline, and compared with a new alloy that will be developed. This new alloy is being developed by German partners with the aim of offering, to the automotive sector, a light alloy with improved formability and mechanical properties (with an increased proportion of aluminium in the alloy). The formability studies performed in this project will allow our Canadian industrial partner to assess the potential uses of the baseline magnesium alloy sheets, as well as the new alloy sheets, for the production of automotive parts by stamping at room temperature and moderate temperatures (up to 250°C). With the growing demand for lightweight automotive components, research projects on new materials and technology are mandatory for our industries to maintain their leadership in this highly competitive market.