采用水冷铜坩埚真空感应熔炼技术制备名义成分为Ti-45Al-5.4V-3.6Nb-0.3Y(摩尔分数,%)的高质量合金铸锭,采用XRD、OM、SEM及TEM等分析手段分析研究该合金的组织演变过程,同时进行力学性能测试.结果表明:Ti-45Al-5.4V-3.6Nb-0.3Y合金具有近层片组织结构,由γ、α2和β三相组成;经包套锻造处理后,合金的晶粒尺寸显著减小,由100 μm下降至7 μm左右;合金的室温屈服强度提高220 MPa左右,达到620 MPa,室温伸长率提高到1.08%;经700 ℃处理后,该合金的屈服强度从562 MPa升高到708 MPa,伸长率从7.6%提高到35.55%.
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