研究了元素Y和Nb对用熔体快淬法制备的TiAl基快速凝固合金组织及性能的影响.发现添加Y的快速凝固TiAl合金主要为等轴晶,主要组成相为α2和少量的γ相.随着Y含量的增加,γ相的含量增加,快速凝固TiAl合金的组织逐渐细化.不同Nb含量的快速凝固TiAl合金的组织为块状结构和层片状结构,主要由γ和α2两相组成,层片间距显著细化,为15～17 nm.快速凝固TiAl合金的硬度比其铸态合金显著提高.
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