Zhang Yufei, Zhang Guowei, Wang Mingjie, Xu Hong
School of Materials and Environment, Shanxi Jinzhong Institute of Technology, Jinzhong 030600, China.
School of Materials Science and Engineering, North University of China, Taiyuan 030051, China.
Materials (Basel). 2025 Apr 22;18(9):1898. doi: 10.3390/ma18091898.
Aluminum/steel bimetal combines the advantages of aluminum alloy and steel, greatly leveraging the value of various industrial fields, especially in improving engine performance and fuel economy. However, it is very difficult to prepare products with good interface bonding strength. The fundamental issue stems from the presence of an excessively thick interface layer and brittle intermetallic compounds. Therefore, this study employed a 50 μm-thick Ni interlayer to control the interface layer thickness, thereby enhancing the Al/steel interfacial bonding strength. A systematic investigation was conducted on the effects of hot dip duration on the interfacial microstructure and mechanical properties of Al/steel bimetal. The influence of hot dip duration on the microstructure and mechanical properties of aluminum/steel bimetal interface was systematically studied. The results show that the 50 μm Ni intermediate layer was used to effectively control the transition layer thickness and improve the interfacial bonding strength of aluminum steel. The thickness of the interface layer gradually increases with the increase in the hot-immersion time. The thickness of the interface layer composed of the two phases of τ-AlFeSi and FeAl on the steel side increases first and then decreases, while the interface layer composed of the two phases of τ-AlFeSi and FeAl on the aluminum side decreases first and then increases. When the hot dip time is 240 s, the shear strength of Al/steel bimetal with 50 μm Ni interlayer showed 75% enhancement compared to Ni-free counterparts.
铝/钢双金属结合了铝合金和钢的优点，极大地发挥了在各个工业领域的价值，特别是在提高发动机性能和燃油经济性方面。然而，制备具有良好界面结合强度的产品非常困难。根本问题源于存在过厚的界面层和脆性金属间化合物。因此，本研究采用了50μm厚的镍中间层来控制界面层厚度，从而提高铝/钢界面结合强度。对热浸时间对铝/钢双金属界面微观结构和力学性能的影响进行了系统研究。系统研究了热浸时间对铝/钢双金属界面微观结构和力学性能的影响。结果表明，采用50μm镍中间层有效地控制了过渡层厚度，提高了铝钢界面结合强度。界面层厚度随着热浸时间的增加而逐渐增大。钢侧由τ-AlFeSi和FeAl两相组成的界面层厚度先增大后减小，而铝侧由τ-AlFeSi和FeAl两相组成的界面层厚度先减小后增大。当热浸时间为240s时，带有50μm镍中间层的铝/钢双金属的剪切强度比无镍的对应物提高了75%。
