Enhanced Tensile Performance of Laser Additive Manufactured Tix-AlCoCrFeNi2.1 High Entropy Alloys

TixAlCoCrFeNi2.1 (where x = 0, 0.15, 0.3) eutectic high-entropy alloys (EHEAs) were synthesized using the Laser Energy Net Shaping (LENS) technique. The effects of minor Ti additions on the microstructural characteristics were examined utilizing scanning electron microscopy (SEM), accompanied by tensile testing to assess mechanical properties. The findings demonstrate a morphological transition in the microstructures from lamellar to petal-like configurations as distinct Ti contents are incorporated. Concurrently, an augmentation in Ti content leads to a progressive enhancement in ultimate tensile strength (UTS), albeit with a marginal reduction in elongation. Notably, the Ti0.15AlCoCrFeNi2.1 alloy produced through LENS fabrication exhibits a favorable synergy between UTS (1420 MPa) and satisfactory ductility (8%), thereby providing valuable insights for the optimization of high-entropy alloy design.