Abstract

In the present work, Al₂O₃/A356 nano composites with different Al₂O₃ nano sizes (10 and 20 nm) and weight percentages (1 and 2 wt.%) have been prepared using rheocasting technique and followed by hot deformation at 250 °C with different ratios (30 and 40%). Pin on disc wear test was used to study wear behavior of prepared Al₂O₃/A356 nano composites while scanning electron microscopy used to build up the wear mechanism. The results showed that the hot deformed nano Al₂O₃ /A356 composites have lower wear rate compared with non deformed one. Furthermore, with increasing the particle size and percentage of Al₂O₃ nano particles, wear rate decreased. The optimal result was achieved at the nano-composite containing 20 nm Al₂O₃ particles after hot deformation with ratio of 40%. SEM studies of the worn surfaces of nano composites showed that the main wear mechanism was oxidative in conjunction with metallic one.

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