Observation of weakened and strengthened creep behavior in Ti/TiB(w) composites at high temperatures

TiB and TiC reinforced titanium matrix composite was in situ synthesized by consumable vacuum arc remelting and hot-forging based on reaction between titanium, B 4 C 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 ¼ 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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Effect of Heat Treatment on Creep Properties of in situ Synthesized (TiB+La2O3)/Ti Composite

Han

Yang

et al. 2019

Front. Mater.

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TiB+La 2 O 3)/IMI834 titanium matrix composites (TMCs) were developed by in situ synthesized in a consumable vacuum arc-remelting furnace. A new TRIPLEX treatment and β heat treatment were developed in this study. The effect of heat treatment on microstructure, tensile properties and creep rupture behavior of in situ synthesized (TiB+La 2 O 3)/IMI834 titanium matrix composites (TMCs) and corresponding matrix alloy were investigated. The results show that widmanstätten and lamellar α structure formed after the new TRIPLEX heat treatment procedures. Compared with traditional β heat treatment, the creep strain rate increases slightly, but the elongation increases significantly (increase 126% at 293 K, 59.13% at 873 K). The fracture mechanism is attributed to the broken of TiB whiskers after bearing high stress. The creep fracture mechanism is due to the load transfer of TiB whiskers and interfacial debonding. The Creep strain rates of TMCs are lower than that of matrix alloy, which is attribute to that loading of TiB and the pinning effect of finer La 2 O 3 particles on dislocation movement.

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Observation of weakened and strengthened creep behavior in Ti/TiB(w) composites at high temperatures

Cited by 3 publications

References 20 publications

Transverse creep induced by interfacial diffusion in fiber-reinforced composites: A micromechanics model and computational validation

Transverse creep induced by interfacial diffusion in fiber-reinforced composites: A micromechanics model and computational validation

Creep Behavior of <I>In Situ</I> Synthesized 7715D Titanium Matrix Composite

Effect of Heat Treatment on Creep Properties of in situ Synthesized (TiB+La2O3)/Ti Composite

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