Evaluation of dissimilar metal joining of aluminum alloy to stainless steel using the filler metals with a high-entropy design. (October 2020)

• Record Type: Journal Article
• Authors: Liu, Dejia; Wang, Jian; Xu, Maobao; Jiao, Haitao; Tang, Yanchuan; Li, Deying; Zhao, Longzhi; Han, Shanguo
• Is Part Of: Journal of manufacturing processes. Volume 58(2020)
• Page Start: 500
• Page End: 509
• Publication Date: 2020-10
• Subjects: High-entropy filler metals -- Dissimilar welding -- Fe-Al intermetallic compounds -- Simple microstructure -- Unmixed zones; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2020.08.031
• Languages: English
• ISSNs: 1526-6125

Abstract

Highlights: The filler metals with a high-entropy design were used to achieve the dissimilar metal joining of aluminum to steel. High-entropy structures could be achieved in the weld zones by using two high-entropy filler metals. High-entropy effect can significantly inhibit the formation of Fe-Al intermetallic compounds in the Al/steel joints. Abstract: 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 CoZnCuMn0.8 Si0.2 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 CoZnCuMn0.8 Si0.2 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 CoZnCuMn0.8 Si0.2 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.