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对镍原子百分数分别为０％，０．２％和０．５％的ＴｉＡｌ合金试样在１０５０℃和１１５０℃进行了层片组织分解退火实验。并对ＴｉＡｌ合金的铸态组织和不同条件下退火的组织进行了金相分析。结果表明：镍的加入细化了合金的铸态组织，促进了层片组织分解，显著缩短了分解退火时间。镍原子百分数为０．５％的ＴｉＡｌ合金在１１５０℃下退火１６８ ｈ即可获得均匀细小的等轴近γ组织。
TiAl alloy samples with 0%, 0.2% and 0.5% atomic percent of nickel were annealed at 1050 ℃ and 1150 ℃ respectively. The microstructure of the as-cast TiAl alloy and the annealed structure under different conditions were analyzed. The results showed that the addition of nickel refined the as-cast microstructure of the alloy, promoted the decomposition of the lamellar structure and shortened the decomposition annealing time significantly. TiAl alloy with 0.5% atomic percent of nickel was annealed at 1150 ℃ for 168 h to obtain uniform and fine equiaxed near γ microstructure.