Effect Of Particulate Reinforcement On The Wear Properties Of Mg-Al Nano Composite

Muhammad Khairul Nizam, Saaey (2013) Effect Of Particulate Reinforcement On The Wear Properties Of Mg-Al Nano Composite. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Since Carbon Nanotube had been found, these materials have become the interest to be used as reinforcement inside metal matrix due to its superior properties. Thus, carbon nanotube (CNT) in nano size reinforced magnesium matrix composites are expected to have many applications in aerospace, aircraft, automobile and electronic industries. In this study, magnesium metal matrix composites containing several weight percentages of carbon nanotube were prepared by using powder metallurgy method followed by extrusion process. As increasing of the weight percentage (weight %) of the CNT, the density and hardness properties of material were increasing. This due to the denser CNT compared to the magnesium alloy matrix and the improvement of load transfer between matrix and CNT due to formation of carbide (Al2MgC2). The specific wear rate was reduced by increasing weight % of CNT due to the self-lubricating behavior of the CNT that will help to reduce the contact area between pin and disk surface. At sliding speed of 0.5 m/s, the wear mechanism was abrasion where deep groove and scratch can be seen below SEM image. Increasing of sliding speed of 2.5 m/s the deep groove has changed to shallow groove due to changing mode of cutting to ploughing. And increasing the sliding speed to 4.5 m/s, the adhesion mechanism has occurred where the row of furrow and plastic deformation can be seen. Thermal softening and fatigue crack also has happened at this sliding speed. Thus the CNT has helped to improve the hardness and wear properties of the metal matrix composite if the CNT dispersed well inside the composite.

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