α-Al纳米晶复合非晶Al合金因其高比强度、高耐蚀性在航空航天领域有着广阔的应用背景。研究发现，α-Al纳米晶的存在可显著提高该类材料的耐点蚀能力，而这与α-Al晶体尺寸、相界面组元分布等特性有关。迄今，该类复合材料中微结构特性与微观点蚀行为的内在关联性尚不清楚，亟待澄清。本项目拟以Al-TM（过渡族元素）-RE（稀土元素）体系为研究对象，从Al-RE及Al-TM二元合金出发，系统地研究α-Al相尺寸、非晶基体的界面成分分布与腐蚀性能的内在联系。主要内容包括：1）α-Al相周围非晶基体成分的原子尺度定量表征；2）TM及RE元素影响腐蚀性能的本质及二者的协同作用机制；3）α-Al纳米粒子尺寸对界面成分分布特性及腐蚀性能的影响规律；4）以非晶Al合金复合材料微区成分对腐蚀性能的作用机理研究成果指导下，进行高耐蚀新型非晶Al合金成分设计，为推动其作为高耐蚀防护涂层的应用提供重要的科学与应用依据。

The α-Al nanocrystals precipitated amorphous Al alloys have broad prospect of applications in aerospace field due to their high specific strength and excellent corrosion resistance. It is found that the existence of nano α-Al particles increases the pitting corrosion resistance of this kind of composites, which is closely related to the sizes of the α-Al particle and the composition profiles in the amorphous matrix. To date, the influence of the microstructure characteristics on the pitting corrosion in this kinds of α-Al nanocrystals precipitated amorphous Al alloys remains unclear and is urgent to be clarified. In this project, the Al-TM (transition metal elements)-RE (rear earth elements) alloy systems are selected. The binary Al-TM and Al-TE alloy are firstly selected to systematically study the effecs of the size of the α-Al nanocrystals, composition profiles in the amorphous matrix upon the corrosion resistance. The detailed contents contain three aspects: (1) atomic-scale and quantitative measurements and analyses of the composition profiles in the amorphous matrix around nanoscale α-Al phase. (2) the feature of the TM and RE independently and synergistically affecting the corrosion resistance of α-Al/amorphous composites. (3) The size effect of α-Al nanophases in altering the compositional distribution in the remaining amorphous matrix and the corrosion resistance of amorphous composites. (4) Based on the obtained relationship between the microstructure characteristics and the pitting corrosion, the high corrosion resistant amorphous Al alloys could be designed. This will provide scientific evidences and application foundation for enhancing the practical applications of Al-based amorphous composites in many important industrial fields.