Effect of rare-earth additions on the microstructure and mechanical properties of die-cast mg alloys AE44-4 and AE44-2

稀土添加对压铸镁合金AE44-4和AE44-2显微组织和力学性能的影响

• 批准号: 514221-2017
• 负责人: Klassen, Robert
• 金额: $ 1.77万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=655711
• 关键词: Effect; rare; earth; additions; microstructure

The magnesium alloy AE 44-4 is designed for use at elevated temperature, up to about 200°C, but is more expensive, and thus less competitive, than steel and aluminum alternatives. This arises because the good high-temperature mechanical properties of AE 44-4 result from the addition of up to 4% rare earth elements. A relatively new version of the alloy, AE44-2, is a lower cost formulation but its elevated temperature performance has not been thoroughly investigated. By conducting laboratory scale controlled casting trials, characterizing microstructure, and probing mechanical behavior at the micro-scale we will quantify and report on the relationships between solidification conditions and as-cast microstructures and generate a microstructure- and temperature-dependent mechanical property dataset for the elevated temperature properties of the AE44-2 and the AE44-4 Mg alloys. These results will subsequently be incorporated into the research team's Integrated Computational Materials Engineering (ICME) models, thus enabling our industrial partner, Meridian Lightweight Technologies Inc. (Strathroy, ON) to make realistic predictions of the spatially varying, high-temperature mechanical performance of high pressure die cast AE44-2 and compare these to similarly die cast AE44-4 and other common die cast magnesium alloys.*Successful completion of this research project will give our industrial partner improved competitiveness over other Mg suppliers and other materials through improved casting optimization capability and the ability to shorten the AE44-2 product development cycle.

镁合金 AE 44-4 设计用于高达约 200°C 的高温，但比钢和铝替代品更昂贵，因此竞争力较差。这是因为 AE 具有良好的高温机械性能。 44-4 是添加了高达 4% 的稀土元素的合金，AE44-2 是一种成本较低的配方，但其高温性能尚未通过实验室规模的控制铸造进行彻底研究。通过试验、表征微观结构和探测微观尺度的机械行为，我们将量化并报告凝固条件和铸态微观结构之间的关系，并为 AE44 的高温性能生成微观结构和温度相关的机械性能数据集-2 和 AE44-4 镁合金这些结果随后将被纳入研究团队的集成计算材料工程 (ICME) 模型中，从而使我们的工业合作伙伴 Meridian Lightweight Technologies Inc.（Strathroy， ON）对高压压铸 AE44-2 的空间变化高温机械性能进行现实预测，并将其与类似压铸 AE44-4 和其他常见压铸镁合金进行比较。*成功完成该研究项目将通过提高铸造优化能力和缩短 AE44-2 产品开发周期的能力，使我们的工业合作伙伴提高相对于其他镁供应商和其他材料的竞争力。