Creep behavior of in situ synthesized 7715D titanium matrix composite

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  • Wang Pan
    State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University
  • Qin Jining
    State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University
  • Lu Weijie
    State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University
  • Chen Yifei
    State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University

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タイトル別名
  • Creep Behavior of <I>In Situ</I> Synthesized 7715D Titanium Matrix Composite

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説明

TiB and TiC reinforced titanium matrix composite was in situ synthesized by consumable vacuum arc remelting and hot-forging based on reaction between titanium, B4C powder and graphite powder. The phases were analyzed through X-ray diffraction. The microstructure was examined by means of optical microscopy (OM) and scanning electron microscopy (SEM). Creep behavior was tested at three temperatures: 600°C, 650°C and 700°C respectively within a stress range 100∼350 MPa. Class I solution behavior was observed and true stress exponent n=3.5 was obtained for the composite. Threshold stress, load transfer and micro-structural strengthening are considered for reasonably explaining the creep behaviour. It is concluded that strengthening mechanism can be owed to co-effect of all the three factors. True activation energy equal to 343 kJ/mol was obtained after compensation by threshold stress.

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