Abstract This study was the first to apply powder metallurgy for the fabrication of a MoSiBTiC alloy. Spherical MoSiBTiC alloy powders were manufactured by ingot crushing, plasma spheroidization, and gas atomization, and the effects of the powder manufacturing methods on the powder characteristics, sintered microstructures, and creep behaviors were elucidated. The plasma-spheroidized (PS) powder exhibited the highest flowability due to the excellent particle circularity of 0.94; however, its oxygen content was much higher than that of the gas-atomized (GA) powder. The GA powder exhibited an extremely low oxygen content of 390 ppm; however, its flowability was lowered because of many irregular-shaped particles. The consolidation of these powders by hot isostatic pressing (HIP) was completed, and a fully dense sample without any defects could be obtained for all the powders regardless of the flowability. The cross-sectional microstructures of the powder particles were largely varied depending on the powder fabrication methods, which resulted in the formation of different HIP microstructures. The high-temperature creep behavior was strongly dependent on the HIP microstructure. The HIP sample fabricated from the crushed powder exhibited the highest creep resistance due to the coarse microstructure compared to other samples with equiaxed microstructures fabricated from PS and GA powders.

中文翻译：

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P/M Mo-Si-B基合金的粉末性能、显微组织和蠕变行为

摘要 本研究首次应用粉末冶金技术制备 MoSiBTiC 合金。通过铸锭破碎、等离子球化和气体雾化制备球形MoSiBTiC合金粉末，并阐明了粉末制造方法对粉末特性、烧结显微组织和蠕变行为的影响。等离子球化 (PS) 粉末由于具有 0.94 的优异颗粒圆形度而表现出最高的流动性；然而，其含氧量远高于气雾化 (GA) 粉末。GA 粉末的氧含量极低，为 390 ppm；然而，由于许多不规则形状的颗粒，其流动性降低。通过热等静压 (HIP) 完成这些粉末的固结，无论流动性如何，所有粉末都可以获得完全致密的样品，没有任何缺陷。粉末颗粒的横截面微观结构根据粉末制造方法的不同而有很大差异，这导致形成不同的 HIP 微观结构。高温蠕变行为强烈依赖于 HIP 微观结构。与其他具有由 PS 和 GA 粉末制成的等轴微观结构的样品相比，由压碎的粉末制成的 HIP 样品由于具有粗糙的微观结构而表现出最高的抗蠕变性。高温蠕变行为强烈依赖于 HIP 微观结构。与由 PS 和 GA 粉末制成的具有等轴微观结构的其他样品相比，由压碎的粉末制成的 HIP 样品由于具有粗糙的微观结构而表现出最高的抗蠕变性。高温蠕变行为强烈依赖于 HIP 微观结构。与由 PS 和 GA 粉末制成的具有等轴微观结构的其他样品相比，由压碎的粉末制成的 HIP 样品由于具有粗糙的微观结构而表现出最高的抗蠕变性。