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 CoZnCuMn_0.8Si_0.2 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 CoZnCuMn_0.8Si_0.2 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 CoZnCuMn_0.8Si_0.2 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.

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。