压力和超声波作用下铝合金中富铁相的形成特点及其对合金力学性能的影响

铁是铝合金中难以避免且对合金性能危害很大的杂质元素，废铝回收时铁还会不断累积，控制富铁相的危害是铝合金生产过程中实现节能减排、资源循环高效利用的关键环节。本项目以高铁含量Al-Cu合金为研究对象，将挤压铸造技术、超声处理技术与中和变质处理技术相结合，分析合金中富铁相的形成特点及其对合金力学性能的影响。通过本项目研究，将明晰铝铜合金中富铁相类型、凝固顺序和相变反应，阐明超声处理和挤压铸造耦合作用过程中富铁相的形成特点，揭示富铁相对高铁含量Al-Cu合金力学性能影响的规律。本项目研究对开发高性能、低成本铝合金新材料，推动铝再生及其高效利用，实现绿色铸造有着重要的促进作用。

Iron is thought to be a very harmful impurity element and difficult to remove in aluminum alloys, which will accumulate in recycled aluminum alloys. It is critical to control the detriment of the Fe-rich intermetallic phases in order to improve the energy saving, emission reduction and high efficient utilization of resources in aluminum industry. In this proposal, the Al-Cu-based alloys with high iron contents will be investigated by combining the ultrasonic treatment, the squeeze casting processing and the nutralization of the Fe-rich intermetallic phases. The attempt focuses on the formation of the Fe-rich intermetallic phases and its effects on the mechanical propterty of the alloys. Based on this study, The type of the Fe-rich intermetallic phases, the solidification sequences and the solidification reactions in Al-Cu-based alloys will be clarified. Furthermore, the solidification characteristics of the Fe-rich intermetallic phases in Al-Cu-based alloys coupled by ultrasonic treatment and squeeze casting and its effects on the mechnical property of the alloys will be revealed. Finally, the achievement of the project is helpful for the development of the high performance low cost aluminum alloys and the promotion of high efficient utilization of reclyced aluminum alloys and it is also available for green casting.