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

开发具有增强成型性的镁合金板，用于车辆轻量化

• 批准号: 531057-2018
• 负责人: Marin, Gheorghe
• 金额: $ 5.46万
• 依托单位: Cégep de Trois-Rivières
• 依托单位国家: 加拿大
• 项目类别: Applied Research and Development Grants - Level 2
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=719676
• 关键词: Development; magnesium; alloy; sheet; enhanced

With their low density and high specific stiffness, magnesium alloys offer great possibilities for vehiclelightweighting. One of the issues associated with their use is their low formability at room temperature. Athigher 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 randomtextures are obtained by the addition of rare earths elements (REEs) as alloying elements. However, theseelements 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 finemicrostructures in various metal sheets. During this process, the difference in speed between the top andbottom rollers induces shear stresses that promote recrystallization, therefore producing sheets with finergrains. Sheets produced using this process show improved formability and good mechanical properties. In thisproject, the formability of magnesium sheets produced by asymmetric rolling will be studied. Two commonalloys (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, alight alloy with improved formability and mechanical properties (with an increased proportion of aluminium inthe alloy). The formability studies performed in this project will allow our Canadian industrial partner to assessthe potential uses of the baseline magnesium alloy sheets, as well as the new alloy sheets, for the production ofautomotive parts by stamping at room temperature and moderate temperatures (up to 250°C). With thegrowing demand for lightweight automotive components, research projects on new materials and technologyare mandatory for our industries to maintain their leadership in this highly competitive market.

镁合金具有低密度和高比刚度，为车辆轻量化提供了巨大的可能性。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。在较高的温度下，由于附加滑移系统的激活，它们的成形性得到改善。然而，在高温下成形需要额外的工具和能源成本，并延长了循环时间。另一种改善镁成形性的方法是控制其织构和微观结构。随机织构以及细晶粒导致孪晶的减少和可成形性的增加。通常，通过添加稀土元素（RE）作为合金元素来获得更随机的织构。然而，这些元素是昂贵的，并且存在与其生产、加工和利用相关的许多环境和健康问题。最近，人们研究了非对称轧制作为在各种金属板材中生产精细微观组织的一种方法。在此过程中，上下辊之间的速度差会产生剪切应力，从而促进再结晶，从而生产出具有更细晶粒的板材。使用该方法生产的片材显示出改进的可成形性和良好的机械性能。本计画主要研究非对称轧制镁合金板材之成形性。两种普通合金（AZ31和ZEK100）将被用作基准，并与即将开发的一种新合金进行比较。这种新合金由德国合作伙伴开发，旨在为汽车行业提供具有更好的成形性和机械性能的轻质合金（合金中铝的比例增加）。该项目中进行的可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型合金板材在室温和中温（高达250 °C）冲压生产汽车零部件方面的潜在用途。随着对轻量化汽车零部件的需求不断增长，我们的行业必须开展新材料和新技术的研究项目，以在这个竞争激烈的市场中保持领先地位。