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Fabrication and Analysis of Aluminium with Graphite Reinforcement Based Metal Matrix Composites

S. Sathishkumar
Source: S. Sathishkumar, "Fabrication and Analysis of Aluminium with Graphite Reinforcement Based Metal Matrix Composites,” Journal of Mechanical Engineering Research and Developments, vol. 40, no. 3, pp. 456-465, 2017. 
 
Document Type: Research Article

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Abstract: The ability of graphite particulates on the dry sliding wear behavior of aluminum alloy (Al) 7075 graphite composites has been evaluated using pin-on-disc tools. The materials were fabricated by a liquid casting technique. Composites with 8 wt% graphite particles were processed. The casted composites were subjected to T6 heat treatment. The effect of sliding speed and sliding distance has been studied under dry sliding conditions. The hardness of the composites is measured using a Brinell hardness tester and their tensile strength is measured using a universal testing machine. The wear rate of the composites reduced with the addition of graphite content and reached a minimum with 8 wt% graphite content. The coefficient of friction is decreased with the addition of graphite content and reached a minimum at 8 wt% graphite. The effect of graphite on hardness and tensile strength is also studied. The 7075(Al) aluminum alloy exhibited its probable to act effectively as a self-lubricating material under dry sliding conditions in the lower range of graphite content, and 8 wt% graphite appeared to be optimum.

Keywords: Aluminum alloy, Graphite, Composites, Universal testing, Heat treatment.