16:30 〜 16:50
[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
キーワード: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 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.