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Advances in Materials Science and Engineering
Volume 2013 (2013), Article ID 216536, 8 pages
http://dx.doi.org/10.1155/2013/216536
Research Article

Wear Behaviour of Eutectic Al-Si Alloy-Graphite Composites Fabricated by Combined Modified Two-Stage Stir Casting and Squeeze Casting Methods

1Department of Mechanical Engineering, Karpagam College of Engineering, Coimbatore 641032, India
2Department of Metallurgical Engineering, PSG College of Technology, Coimbatore 641004, India

Received 19 May 2013; Accepted 22 July 2013

Academic Editor: Pavel Lejcek

Copyright © 2013 P. Shanmughasundaram and R. Subramanian. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Dry sliding wear behaviour of eutectic Al-Si alloy-graphite composites was investigated employing a pin-on-disc wear test rig. Results revealed that the wear and friction coefficients decreased linearly with increasing weight percentage of graphite particles. Wear resistance of the composite increased considerably with increasing sliding velocity at constant load. In contrast, the friction coefficient of Al-7.5 wt.% Gr composite increased when the sliding velocity was increased from 1 m/s to 2 m/s at 49 N. Worn-out surfaces of wear specimens after the test were examined by scanning electron microscopy to study the morphology of worn surfaces. EDS analysis was carried out to investigate the influence of mechanically mixed layer (MML) which comprises oxides and iron, and this acted as an effective tribolayer in enhancing the wear resistance at higher sliding velocity.