本文研究了Ti-3.84Al-6.2Mo-10.43V-1.85Fe合金中TiC的析出行为.当合金经低于α+β→β转变温度加热淬火之后,在α/β相界面上存在TiC膜,其形貌与α-β双相合金中TiH_2界面相类似.TiC界面相提供了裂纹易扩展途径和裂纹萌生点.断口也与TiH_2界面相引起的相似.经β固溶处理后再等温时效,在有些试样的电子衍射花样中观察到了弧形衍射(2α相的特征衍射).根据合金成分和点阵常数分析,产生弧形衍射的质点可能是TiC,而非所谓的2α相.
The precipitation behaviour of TiC in the Ti-3.84Al-6.24Mo-10.43V-1.85Fe alloy has been investigated. TiC layer was found to exist at the α/βinterface boundaries in the sample solution treated just below β transus and quenched.The morphology of TiC is similar to that of the interface Phase (IFP) TiH_2 inthe α-β two phase alloy. The IFP TiC provides a site for crack initiation as wellas an easier path for crack propagation. The morphology of fracture surface is alsosimilar to that caused by TiH_2. Arch diffraction patterns were found in some speci-mens after solution treatment and isothermal aging. The structure and lattice para-meters were analyzed and it was shown that the particles which bring about thearch diffraction might be TiC, instead of the "type 2" α phase.
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