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金属学报  2011 

TiAl预合金粉末的表征和后续致密化显微组织特点

DOI: 10.3724/SP.J.1037.2011.00136, PP. 1263-1269

Keywords: TiAl,气体雾化,亚稳相,微观偏析

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Abstract:

采用感应熔炼气体雾化法制备了TiAl预合金粉末.粉末粒度主要分布在100-250μm,呈正态分布,粉末平均粒度为120.7μm.TiAl预合金粉末的相组成与粒度分布有关,γ相所占比例越高,预合金粉末粒度越大.小粒度的预合金粉末主要由α2相组成;预合金粉末在温度高于500℃时效处理,发生α2→γ转变.TiAl预合金粉末相组成不同会产生后续热等静压组织局部粗化现象.XPS结果表明TiAl预合金粉末颗粒表面形成Al2O3和TiO2薄膜.

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