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Evaluation of dissimilar metal joining of aluminum alloy to stainless steel using the filler metals with a high-entropy design
Journal of Manufacturing Processes ( IF 6.1 ) Pub Date : 2020-08-28 , DOI: 10.1016/j.jmapro.2020.08.031
Dejia Liu , Jian Wang , Maobao Xu , Haitao Jiao , Yanchuan Tang , Deying Li , Longzhi Zhao , Shanguo Han

Fe-Al intermetallic compounds (IMCs) have huge adverse effects on the dissimilar metal joining of aluminum to steel. High-entropy alloys can use high mixing entropy to promote the formation of single-phase solid solution structures, which would have significant advantages in inhibiting the formation of Fe-Al IMCs in the welding of Al/steel joints. In this study, three types of filler metals, including CoZnCuMn0.8Si0.2 powders with a high-entropy design, the FeCoCrNiMn high-entropy alloy powders, and the comparative Al-12Si powders, were used to join the dissimilar metals between Al 6061 alloy and 304 stainless steel by laser deposition welding. It was found that high-entropy filler metals, including CoZnCuMn0.8Si0.2 and FeCoCrNiMn powders, could successfully be used to join dissimilar metals of aluminum to steel. The high-entropy effect could be achieved in the weld zones (WZs) by using CoZnCuMn0.8Si0.2 and FeCoCrNiMn powders, which could significantly inhibit the formation of Fe-Al IMCs in the WZs, and promote the formation of fine and equiaxed grains, without element segregation, in the WZs. An unmixed zone with a width of 10−20 μm was formed between the WZ and HAZ in the Al 6061 alloy side for those two dissimilar joints. And some Fe-Al IMCs with submicron or nanoscale size were presented in the unmixed zones.



中文翻译:

使用高熵设计的填充金属评估铝合金与不锈钢的异种金属连接

Fe-Al金属间化合物(IMC)对铝与钢的异种金属结合具有巨大的不利影响。高熵合金可以利用高混合熵来促进单相固溶体结构的形成,这在抑制铝/钢接头的焊接中抑制Fe-Al IMC的形成方面将具有明显的优势。在这项研究中,使用三种类型的填充金属(包括具有高熵设计的CoZnCuMn 0.8 Si 0.2粉末,FeCoCrNiMn高熵合金粉末和比较的Al-12Si粉末)来连接Al 6061合金之间的异种金属。和304不锈钢通过激光熔敷焊接。发现高熵的填充金属,包括CoZnCuMn 0.8 Si 0.2FeCoCrNiMn和FeCoCrNiMn粉末可以成功地将异种金属铝与钢连接起来。通过使用CoZnCuMn 0.8 Si 0.2和FeCoCrNiMn粉末,可以在焊缝区(WZs)中获得高熵效应,这可以显着抑制WZs中Fe-Al IMC的形成,并促进细晶粒和等轴晶粒的形成,在WZ中没有元素隔离。对于这两个不同的接头,在Al 6061合金侧的WZ和HAZ之间形成了宽度为10-20μm的未混合区。在未混合区中,存在一些亚微米或纳米级的Fe-Al IMC。

更新日期:2020-08-28
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