Dissimilar gas tungsten arc welding of AlCoCrFeNi2.1 eutectic high entropy alloy to 316L stainless steel

In this study, the free-defect AlCoCrFeNi 2.1 /316L dissimilar welded joint was first obtained by utilizing the tungsten inert gas welding technique. The microstructure and tensile properties of the welded joints were then characterized. The results demonstrate that the grains in the fusion zone (FZ) are formed of columnar and equiaxed grains. The AlCoCrFeNi 2.1 /316L dissimilar welded joint exhibits a tensile strength of 1042 MPa and the elongation increased by ∼14% when compared with the AlCoCrFeNi 2.1 welded joint. The Vickers hardness test revealed that obvious variations happen across the FZ, heat-affected zone (HAZ), and base metal (BM), with peak hardness occurring near the fusion line on the AlCoCrFeNi 2.1 side. The fracture location of the welded joint appeared in the FZ on the AlCoCrFeNi 2.1 side, indicating a possible stress concentration in this region. This work may provide a base for the further investigation of the dissimilar joining of the stainless steel and eutectic high entropy alloy .