[T6] AM Beam Based Technologies

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

S. Kumaran^1,2, B. Malladi³, A. Meza¹, E. Hryha³, *J. M. Torralba^1,2 (1.IMDEA Materials Institute, Spain, 2.Universidad Carlos III de Madrid, Spain, 3.Chalmers university of technology, Sweden)

Keywords:: High entropy alloys, commercial commodity powders, laser powder bed fusion, in-situ alloying

High Entropy Alloys (HEAs), a novel class of materials diverging from conventional alloying concept of 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 and Nb 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. Tensile tests at 700oC, 800oC, 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.