Microstructural characterization of SiC/Al and FP/Al metal matrix composites subjected to dynamic loadings
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The Split Hopkinson Pressure Bar technique was used to study the dynamic response of silicon carbide particle- and whisker-reinforced aluminium (SiC/Al-P and SiC/Al-W) and continuous Fibre FP-reinforced aluminium (FP/Al), metal matrix composites, subjected to high strain rates in the range of 300–3200 s−1. The response of these composites was characterized by macroscopic and microscopic observations. Experiments on SiC/Al-W and FP/Al were conducted with the whiskers/fibres oriented in the axial, as well as, in the transverse direction with respect to the loading direction. It was observed that for the silicon carbide-reinforced metal matrix composites, the dynamic flow stress values were consistently higher than the static/quasi-static values. Experiments conducted on FP/Al with the fibres oriented transversely to the loading direction, revealed failure stress values considerably lower than the static/quasi-static values. This anomalous behaviour was attributed to the predominantly shear mode failure of the material. Microscopic observations using optical and scanning electron microscopy corroborate the macroscopically observed behaviour.
KeywordsCarbide Mode Failure Flow Stress Silicon Carbide Microscopic Observation
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