Abstract
A novel MoSiBTiC alloy was fabricated via laser powder bed fusion (L-PBF) combined with the freeze-dry pulsated orifice ejection method (FD-POEM). Spherical MoSiBTiC powders with uniform size distribution and good dispersion of component elemental particles were prepared by FD-POEM, without a melting process. Due to their distinctive mesh-like structure, the laser absorptivity of the FD-POEM particles was as high as 87.3%, allowing the elemental powders to be sufficiently melted under laser irradiation. The L-PBF build was primarily composed of a unique supersaturated solid solution Mo (Mosss) dendrites enriched with Si, Ti and B elements, Mo + Mo5SiB2 nanostructures, and TiC nanoparticles. The Mosss phase exhibited much higher hardness than Mo phase of the as-cast alloy attributing to the grain refinement and the solid strengthening effect. These results of this study provided an approach of fabricating high-performance Mo-based materials in ultrahigh-temperature applications.
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