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 (Mo_sss) dendrites enriched with Si, Ti and B elements, Mo + Mo₅SiB₂ nanostructures, and TiC nanoparticles. The Mo_sss 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.

通过激光粉末床熔合（L-PBF）结合冷冻干燥脉冲孔喷射法（FD-POEM）制备了一种新型MoSiBTiC合金。通过 FD-POEM 制备了粒径分布均匀且组分元素颗粒分散良好的球形 MoSiBTiC 粉末，无需熔化过程。由于其独特的网状结构，FD-POEM颗粒的激光吸收率高达87.3%，使元素粉末在激光照射下充分熔化。L-PBF 结构主要由富含 Si、Ti 和 B 元素的独特过饱和固溶体 Mo (Mo _{sss ) 枝晶、Mo + Mo 5} SiB ₂纳米结构和 TiC 纳米颗粒组成。_苔藓_由于晶粒细化和固体强化作用，相表现出比铸态合金的 Mo 相高得多的硬度。本研究的这些结果提供了一种在超高温应用中制造高性能钼基材料的方法。