采用水冷铜坩埚感应熔炼制备了名义成分为Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y( at％)的大尺寸铸锭,经机械破碎后,采用流化床气流磨和射频等离子体球化工艺制备出高铌TiAl合金粉末,并研究了其特性.结果表明,采用上述工艺可大量制备出球形度高、粒度可控的高铌TiAl合金粉末；粉末的氧含量随粒度的细化而逐渐增加；高铌TiAl合金球形粉末的相组成主要为α2相及少量的β相；球形合金粉的表面和内部组织与粒度密切相关,平均粒度为90μm的粗粉表面及内部均呈枝状,颗粒内部存在网状富Al偏析相,随着粉末粒度减小,球形合金粉末表面趋于光滑,内部偏析逐渐减弱.此外,平均粒度为90μm肌的粗粉各颗粒间成分均匀,随着粉末粒度细化,颗粒间成分均匀性降低.
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