Abstract
ABSTRACT Hybrid Metal Matrix Composites are rising in demand to satisfy advanced technological applications due to their improved mechanical and wear properties. In the present work, a sand moulding process is used to develop the Ni-Cu alloy hybrid metal matrix composites (HMMCs) reinforced with aluminium oxide (Al2O3) and titanium dioxide (TiO2) particles. According to ASTM standard, the fabricated Ni-Cu alloy HMMCs undergo microstructure and tribological evaluation. In this study, tribological properties like wear and coefficient of friction analysis are performed on a pin-on-disc wear testing machine with varying (200, 300 and 400 rpm) speeds (20, 30 and 40 N), loads (1 m/sec), sliding velocity. Micrographic images show fairly uniform distribution of the reinforced elements Al2O3 and TiO2 in the Ni-Cu alloy matrix. An analysis of EDS and XRD reveals the presence of reinforced particulate matter in the Ni-Cu alloy matrix. The wear rate of hybrid composites (0.000366 mm3/N-m) is found to decrease (25%) with an increase in 9 wt. % of TiO2/Al2O3 reinforcement when compared to the base alloy (0.000828 mm3/N-m). It can be observed that the addition of Al2O3 and TiO2 particulates in the base alloy nickel, it’s reduced the co-efficient of friction (0.78) at various loads and speeds.
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