Characterization of Influences of Steel-Aluminum Dissimilar Joints with Intermediate Zinc Layer
Characterization of Influences of Steel-Aluminum Dissimilar Joints with Intermediate Zinc Layer
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DOI：
10.3390/met10040442
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发表时间：
2020-04-01
期刊：
影响因子：
2.9
通讯作者：
Wesling, Volker
中科院分区：
文献类型：
--
作者：
Bick, Tobias;Heuler, Verena;Wesling, Volker
钢和铝连接时会形成脆性金属间化合物相。因此，当将多材料设计应用于荷载适配和重量适配结构的施工时，很难使用这种材料组合。为了在很大程度上避免这些脆性相的形成，基于扩散过程的连接过程，如复合锻造，描述了一种很好的解决方法。这些材料以固体状态连接在一起。此外，还使用了锌添加剂来创建接头。锌与钢和铝形成化合物，不形成脆性相。将复合锻造工艺与锌添加剂相结合，可获得26N/mm(2)的强力值。与以前对电阻点焊和对接接头的研究相比，这一数字更高。接头性能取决于锌中间层的组成。锌夹层中的少量镁影响强度和延性值。与不含镁的锌层相比，强度降低了约30%，延伸率提高了60%。这种影响可能是由于合金化元素对相形成的冶金影响，这可以从接合区的能量色散X射线能谱(EDX)分析中得到证明。结果表明，脆性金属间化合物相只分布在较小的区域内。
Brittle intermetallic phases are formed when steel and aluminum are joined. Therefore, it is difficult to use this combination of materials when applying the multimaterial design in the construction of load-adapted and weight-adapted structures. In order to largely avoid the formation of these brittle phases, joining processes based on diffusion processes, such as composite forging, depict a good solution approach. The materials are joined in a solid state. Furthermore, zinc additives are used to create the joint. Zinc forms a compound with both steel and aluminum without the formation of brittle phases. By combining the composite forging process with zinc additives, strength values of 26 N/mm(2) can be reached. This is higher, in comparison to former investigations of resistance spot welded and clinched joints. The joint properties depend on the composition of the zinc interlayer. Small amounts of magnesium in the zinc interlayer affected the strength and ductility values. While the strength decreased by about 30% in contrast to the zinc layer without magnesium, the ductility increased by 60%. This effect was probably due to the metallurgical impact of the alloying elements on phase formation, as could be shown by energy dispersive X-ray spectroscopy (EDX) analyses of the joint zones. Thereby, it was shown that the brittle intermetallic phases are located only in small areas.