Shen Tianying, Zhang Shasha, Liu Zili, Yu Shuaipeng, Jiang Junchao, Tao Xuewei, Akopyan Torgom, Belov Nikolay, Yao Zhengjun
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Key Laboratory of Materials Preparation and Protection for Harsh Environment, Ministry of Industry and Information Technology, Nanjing 210016, China.
Materials (Basel). 2023 Dec 2;16(23):7488. doi: 10.3390/ma16237488.
The compatibility of the wrought Al-Ca alloy with the element Fe was investigated in the present study. In this work, both the Al-Ca alloy and Al-Ca-Fe alloy were synthesized through melting, casting, heat treatment, and rolling. A new ternary Al-Ca-Fe eutectic phase, identified as AlCaFe with an orthorhombic structure, demonstrated enhanced performance, as revealed by nanoindentation tests. Combining the results of the nanoindentation and EBSD, it can be inferred that during the rolling and heat treatment process, the divorced eutectic phases were broken and spheroidized, and the structure of the Fe-rich alloy became finer, which promotes the formation of fine grains during the process of dynamic recrystallization and effectively hindered the grain growth during thermal treatment. Consequently, the strength of the as-rolled Al-Ca alloy was improved with the addition of 1 wt.% Fe while the ductility of the alloy was maintained. Therefore, adding Ca into the high-Fe content recycled aluminum altered the form of the Fe-containing phases in the alloy, effectively expanding the application scope of recycled aluminum alloy manufacturing. This approach also offered a method for strengthening the Al-Ca aluminum alloys. Compared to the traditional approach of reducing Fe content in alloys through metallurgical means, this study opened a new avenue for designing novel, renewable aluminum alloys highly compatible with impurity iron in scrap.
本研究对变形铝钙合金与铁元素的相容性进行了研究。在这项工作中，铝钙合金和铝钙铁合金均通过熔炼、铸造、热处理和轧制工艺合成。一种新的三元铝钙铁共晶相，被确定为具有正交结构的AlCaFe，经纳米压痕测试显示其性能得到了增强。结合纳米压痕和电子背散射衍射（EBSD）的结果可以推断，在轧制和热处理过程中，离异共晶相被破碎并球化，富铁合金的组织变得更细，这促进了动态再结晶过程中细晶粒的形成，并有效阻碍了热处理过程中的晶粒长大。因此，添加1 wt.%的铁提高了轧制态铝钙合金的强度，同时保持了合金的延展性。所以，向高铁含量的再生铝中添加钙改变了合金中含铁相的形态，有效地扩大了再生铝合金制造的应用范围。该方法还为强化铝钙铝合金提供了一种途径。与通过冶金手段降低合金中铁含量的传统方法相比，本研究为设计与废料中的杂质铁高度相容的新型可再生铝合金开辟了一条新途径。
