54 Citations (Scopus)
31 Downloads (Pure)


The AlCoCrFeNi2.1 eutectic high entropy alloy is of great interest due to its unique mechanical properties combining both high strength and plasticity. Here, gas tungsten arc welding was performed for the first time on an as-cast AlCoCrFeNi2.1 alloy. The microstructural evolution of the welded joints was assessed by combining electron microscopy with electron backscatter diffraction, synchrotron X-ray diffraction analysis and thermodynamic calculations. Microhardness mapping and tensile testing coupled with digital image correlation were used to investigate the strength distribution across the joint. The base material, heat affected zone and fusion zone are composed of an FCC + B2 BCC eutectic structure, although the relative volume fractions vary across the joint owing to the weld thermal cycle. The BCC nanoprecipitates that existed in the base material started to dissolve into the matrix in the heat affected zone and closer to the fusion zone boundary. Compared to the as-cast base material, the fusion zone evidenced grain refinement owing to the higher cooling rate experienced during solidification. This translates into an increased hardness in this region. The joints exhibit good strength/ductility balance with failure occurring in the base material. This work establishes the potential for using arc-based welding for joining eutectic high entropy alloys.

Original languageEnglish
Article number111176
Number of pages18
JournalMaterials and Design
Publication statusPublished - Nov 2022


  • AlCoCrFeNi
  • Digital image correlation
  • Eutectic high entropy alloys
  • Gas tungsten arc welding
  • Mechanical testing
  • Synchrotron X-ray diffraction
  • Thermodynamic calculations


Dive into the research topics of 'Gas tungsten arc welding of as-cast AlCoCrFeNi2.1 eutectic high entropy alloy'. Together they form a unique fingerprint.

Cite this