Abstract
To investigate the mechanisms of nanoparticles influencing the fatigue crack growth (FCG) of metal matrix composites, an in-situ TiB2/7050Al composite was systematically investigated. The nanoscale TiB2 showed a morphology of particle bands coexisting with grain boundaries (GBs) along extrusion direction. The TiB2/7050Al composite presented a finer grain size compared to the 7050Al alloy. The TiB2/7050Al composite exhibited a lower, the similar and a higher FCG rate over the 7050Al alloy at the low, intermediate and high stress intensity factor (ΔK) range, accordingly. The microstructure and ΔK correlated FCG mechanisms of TiB2/7050Al composite were discussed in detail. Inside grains, caused by the finer grain size and the increasing ΔK, the TiB2/7050Al composite exhibited the similar FCG rate compared to 7050Al alloy at low ΔK range, while showed a higher FCG rate at intermediate and high ΔK range. At GBs, along with the increasing ΔK, the TiB2 bands induced fatigue crack deflection, fatigue crack trapping and microvoid coalescence led to the lower FCG rate of TiB2/7050Al composite at low and intermediate ΔK range and the higher FCG rate at high ΔK range, accordingly.
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