PRECIPITATION OF TiC IN METASTABLE β-Ti ALLOY

Acta Metall Sin

1988, Vol. 24

Issue (4): 248-253 DOI:

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PRECIPITATION OF TiC IN METASTABLE β-Ti ALLOY

YU Xuejie;WANG Jianlin;ZHOU Tianjian Shanghai Iron and Steel Research Institute; Anhui Institute of Technology

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YU Xuejie;WANG Jianlin;ZHOU Tianjian Shanghai Iron and Steel Research Institute; Anhui Institute of Technology. PRECIPITATION OF TiC IN METASTABLE β-Ti ALLOY. Acta Metall Sin, 1988, 24(4): 248-253.

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Abstract 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.

Key words: interface phase metastable β-Ti alloy TiC

Received: 18 April 1988

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