Dissimilar gas tungsten arc welding of an AlCoCrFeNi high entropy alloy to 316 L stainless steel

Lopes, J. G.; Agrawal, P.; Gonçalves, R. M.; Shen, J.; Chassaing, D.; Boll, T.; Schell, N.; Mishra, R. S.; Baptista, A. C.; Oliveira, J. P.

http://hdl.handle.net/10362/203266

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High entropy alloys (HEAs) are unique and novel materials with remarkable properties that render them competitive for developing key engineering applications within modern engineering sectors. In the present study, a AlCoCrFeNi HEA was gas tungsten arc welded to 316 L stainless steel, with the aim of assessing the compatibility in terms of microstructure and mechanical performance. These dissimilar joints was obtained with a torch speed of 3.5 mm/s and a current intensity of 90 A under a protective Argon atmosphere. Subsequently, a thorough evaluation of the relationship between processing parameters, microstructure and properties was performed via optical and electron microscopy, atom probe tomography, synchrotron X-ray diffraction, microhardness mapping and tensile testing. The results reveal that the AlCoCrFeNi HEA can be successfully welded with 316 L stainless steel, producing a high-quality and reliable joint, where a gradual microstructural variation is observed across the interface. A good balance of a high tensile strength of ≈568 MPa and fracture strain of ≈11.7% was obtained, with fracture occurring in the fusion zone, highlighting the potential of these dissimilar joints for critical structural applications.

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Atom probe tomography Gas tungsten arc welding High entropy alloys Mechanical testing Microstructure Synchrotron X-ray diffraction Thermodynamic simulations General Materials Science Condensed Matter Physics Mechanics of Materials Mechanical Engineering

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http://hdl.handle.net/10362/203266

DOI

10.1016/j.matchar.2026.116260

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