Manufacturing of FeCoCrNi + FeCoCrNiAl laminated high-entropy alloy by laser melting deposition (LMD)

Abstract The ductility and strength of Fe-Co-Cr-Ni-Al high-entropy alloys (HEAs) present contradictory trends with the increasing Al element content. To broaden the applications of HEAs, new methods must be explored to effectively improve the combination of their mechanical properties. In this study, FeCoCrNi + FeCoCrNiAl-laminated HEA was manufactured by laser melting deposition (LMD), a highly efficient and flexible technology. After manufacturing, the microstructure and mechanical properties of the composite HEA were evaluated. FeCoCrNi LMD-HEA contains only the soft face-centered cubic (FCC) phase, which has excellent dislocation storage capacity, ductility, and toughness. FeCoCrNiAl LMD-HEA has high strength and low toughness due to the hard and brittle body-centered cubic (BCC) phase. The FeCoCrNi + FeCoCrNiAl-laminated HEA presented excellent ductility and strength and superior crack resistance.