CHARACTERISATION OF DIE CAST MAGNESIUM ALLOYS FOR AUTOMOTIVE POWER TRAIN COMPONENTS

镁压铸合金是一种新型的用于制造汽车动力总成部件的合金。虽然这些合金在室温和高温（100-200°C）下都表现出良好的抗拉屈服强度，但在125°C以上的温度下暴露在中等水平的载荷下，它们容易产生过度的蠕变变形。该项目的目的是表征这些合金在温度和应力状态下受蠕变变形控制水平的微观结构，以确定在确定压铸镁合金抗蠕变性能方面重要的微观结构因素。该项目的结果将为进一步提高这些合金的抗蠕变性能和开发具有更高高温抗蠕变性能的新型压铸合金提供有用的指导。

A new group of magnesium die casting alloys has recently been developed for fabricating automotive power train components. While these alloys exhibit good tensile yield strength at both ambient and elevated (100-200°C) temperatures, they are prone to excessive creep deformation when exposed to moderate levels of loads at temperatures above 125°C. The aim of this project is to characterise microstructures of these alloys subjected to controlled levels of creep deformation in the temperature and stress regime of interests, with a view to identifying microstructural factors that are important in determining the creep resistance of die cast magnesium alloys. The outcome of this project will provide useful guidelines for further improvements in creep resistance of these alloys and development of new die cast alloys with higher creep resistance at elevated temperatures.