研究了两步热处理对锻造T i-47Al-2Cr(摩尔分数, %)组织演变和室温拉伸性能的影响. 经1290℃, 4hFC1240℃, 4h, FC+900℃ , 24h热处理后, 锻造TiAl基合金中形成了均匀细小的双态组织, 其室温伸长率, 室温抗拉强度和室温屈服强度分别为3 .5% , 677MPa和597MPa. 在热处理过程中, 锻造TiAl基合金发生了复杂的相变, 其相变过程为: 变形组织→γf+αf→γf+(αf+γs+αs)→γf+ Lf+γs+Ls. 当第二步热处理温度偏低时, αs转变为脆性α2相颗粒, 降低了合金的室温拉伸性能.
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