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In this work, CoCrFeNi and CoCrCuFeNi multi-principal element alloys were welded using an autogenous gas tungsten arc welding process. Tensile testing, microhardness, X-ray diffraction, scanning electron microscopy, electron back scattered diffraction techniques were used to study the mechanical properties, crystal structure and microstructures of the base metals (BMs) and welds. It was found that CoCrFeNi alloy was easily weldable while CoCrCuFeNi alloy produced transverse cracks. Only 13.5% decrease in ultimate tensile strength as compared to its BM was observed in CoCrFeNi alloy. Whereas poor tensile properties were observed in CoCrCuFeNi alloy due to Cu segregation and micro-cracks. Fractography analysis of the BM and weld specimen shows ductile failure in both the alloys.

Microstructural evolution in CoCrFeNi and CoCrCuFeNi alloys processed by autogenous fusion welding