[T6] AM Beam Based Technologies

[15B-T6-23] Developing CoCrFeNi High Entropy Alloy with Mo, Nb, and Al via in situ Alloying in Laser Powder Bed Fusion (PBF-LB/M) and Evaluating Its High Temperature Properties

S. Venkatesh Kumaran^{1, 2}, B. Malladi⁴, A. Meza¹, E. Hryha⁴, *J. M. Torralba^{3, 1} (1.IMDEA Materials, Spain, 2.Arcelor Mittal, Spain, 3.Universidad Carlos III de Madrid, Spain, 4.Chalmers University of Technology, Sweden)

Keywords:High Entropy alloys, In-situ alloying, Laser powder bed fusion, Commodity powders

High Entropy Alloys (HEAs), a novel class of materials diverging from the conventional alloying concept of a single principal element, show immense potential, especially in high-temperature applications. This study leverages Laser Powder Bed Fusion (PBF-LB/M) to manufacture a CoCrFeNi-based HEA alloyed with minor additions of Mo, Nb, and Al using commercial powders like Ni-base superalloys and 316L in a cost-effective approach. The as-printed compositions resulted in alloys with single-phase FCC upon printing. Heat treatments were tailored to achieve a dual-phase FCC/B2 microstructure. Tensile tests at 700^oC, 800^oC, and 900°C reveal enhanced strength compared to similar alloys in the literature, facilitated by Mo and Nb-rich precipitates. This work not only advances understanding of HEAs but also offers insights for future alloy design, highlighting the efficiency of PBF-LB/M in creating intricate components with complex compositions and improved mechanical properties for high-temperature applications with relative ease.