The objective of this paper is to investigate the effect of Multi-Walled Carbon Nanotubes (MWCNTs)
content on microstructure and dry sliding wear behavior of hypo-eutectic A356Al–Si alloy Metal
Matrix Nano-Composites (MMNCs). Composites containing 0.5, 1.5, and 2.5 wt.% MWCNTs were
prepared by rheocasting technique followed by squeeze casting. Characterization of nanocomposites
was done by scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis
(EDX), dry sliding wear tests were performed in a pin-on-disk wear tester against a steel disk at
various speeds and normal loads. Results revealed that a decrease in both wear rate and friction
coefficient of the nanocomposites considerably with the increase of MWCNT’s content. The
formation of the hard compact transfer layer on the pin surface nanocomposites assisted in
increasing the wear resistance of these materials. It is that the transfer layer which was formed
under an applied load of 20 N can act as a protective layer and help in reducing the wear rate. The
results indicate the nano composites could be used in light-weight applications where moderate
strength and wear properties are needed.