Weldability of rolled AlCoCrFeNi_2.1/GH4169 dissimilar joints fabricated by electron beam welding

It has been demonstrated that high-entropy alloys have significant potential for use in high-temperature structural materials, corrosion-resistant coatings, and other fields due to their exceptional thermal stability, corrosion resistance, mechanical properties, and functional characteristics, making them a research hotspot in the international materials science community. The heterogeneous electron beam welded joints of AlCoCrFeNi_2.1/GH4169 were prepared, and then the weldability of the joint was evaluated based on the evolution of microstructure and mechanical properties. The results demonstrated that the rolled AlCoCrFeNi_2.1 exhibited favorable weldability with the GH4169, yielding defect-free welds with nail-head geometry. Under optimized conditions corresponding to a heat input of 114.0 J/mm, the dissimilar joint attains a peak tensile strength of 869.9 MPa, which is equivalent to that of the GH4169 nickel-based super-alloy base material. The evolution of mechanical properties is principally associated with the Laves precipitates phases. A significant correlation was observed between beam current intensity and dual weld attributes (depth/width), contrasting with welding speed's selective influence on width regulation.