本项目将材料-物理-化学等不同学科相结合，研究Mg3Zn6Y准晶强化双相Mg-Li-Zn-Y合金的腐蚀行为及其与微观组织之间存在的内在联系，着重探讨准晶与基体相的界面结构特征，准晶颗粒的时效析出、长大、尺寸、数量、形貌、弥散程度、分布及演变情况，alpha-Mg/beta-Li相层状间隔结构，晶粒结构，晶体学织构和相组成等对合金腐蚀性能参数和腐蚀破坏机制的影响，阐明不同尺度准晶颗粒对合金在腐蚀过程中发生的点蚀、晶内/晶间和相内/相间微电偶腐蚀的作用规律。考虑如何将合金的腐蚀性能参数与微结构之间的变化规律相结合，探索可显著提高合金耐腐蚀性能的加工处理制度及其相关工艺参数，为新型耐蚀镁锂合金的优化设计与工程应用提供理论和实验基础。

This project is to research the corrosion behavior and its relationship to the microstructure of duplex structured Mg-Li-Zn-Y alloys strengthened by Mg3Zn6Y quasicrystalline particles on the basis of the combination of material-physics-chemistry. The emphases are to investigate the characteristics of quasicrystalline/matrix interfacial structure, effects of the precipitation, growth, size, quantity, morphology, dispersive degree, distribution and evolution of quasicrystalline particles, inter-lamellar structure of alpha-Mg/beta-Li phases, grain structure, texture and phase component on the corrosion parameters and corrosion failure mechanisms; to clarify the effect of quasicrystalline particles with different sizes on the occurrence of pitting, the micro corrosion couple of intragranular/intergranular and intraphase/interphase during corrosion process. Finally, consider how to establish the variation relationship between the corrosion parameters and microstructure to explore effective processing technologies and associated parameters for the further improvement of the corrosion resistance, to provide theoretical and experimental basis for the optimised alloying design and engineering applications of new type Mg-Li alloys with high corrosion resistance.