Interactions between Lattice Defects and Nanoscale Solute Aggregates: Strengthening and Creep Mechanisms in Magnesium Alloys

近年来制造和加工技术的进步使镁合金在高温（100-200°C）下的应用重新引起了人们的兴趣。现有合金的强度和抗蠕变性能的提高以及新合金的开发需要更好地了解合金的强化和蠕变机制及其与变形行为的关系。本项目将采用先进的透射电子显微镜和三维原子探针场离子显微镜成像技术，结合拉伸和蠕变试验，研究晶格缺陷和纳米级溶质聚集体之间的相互作用及其对镁合金高温变形行为的定量影响。该项目的目的是发展一个强大的理论，镁合金的设计与提高强度和抗蠕变。

Advances in manufacturing and processing technologies in recent years have brought renewed interests in magnesium alloys for applications at elevated temperatures (100-200°C). Improvement in strength and creep resistance of existing alloys and development of new alloys require better understanding of strengthening and creep mechanisms and their correlations with deformation behaviour of the alloys. In this project, advanced imaging techniques of transmission electron microscopy and three-dimensional atom probe field-ion microscopy, combined with tensile and creep tests, will be used to study interactions between lattice defects and nanoscale solute aggregates and their quantitative effects on deformation behaviour of magnesium alloys at elevated temperatures. The aim of this project is to develop a robust theory for the design of magnesium alloys with improved strength and creep resistance.