An Assessment of Mechanical and Tribological Property of Hybrid Aluminium Metal Matrix Composite

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R. Santosh Kumar, R. Nishanth, V. Seenivasan, S. Sarath Sanmugam, S. Johny James, (2017). An Assessment of Mechanical and Tribological Property of Hybrid Aluminium Metal Matrix CompositeMechanics, Materials Science & Engineering, Vol 10. doi:10.2412/mmse.30.1.536

Authors: R. Santosh Kumar, R. Nishanth, V. Seenivasan, S. Sarath Sanmugam, S. Johny James

ABSTRACT. Composite materials has huge requirement in the area of automobile, aerospace, and wear resistant applications. This study presents the synthesis of composite reinforced with SiC and Al2O3 using gravity stir casting. Stir casting is the manufacturing process that is incorporated to produce the composite material because of its extreme bonding capacity with base material. The composition of reinforcement with 6061 aluminium matrix is SiC-7.5% and Al2O3 -2.5% respectively. The average size of reinforcement particle is 30-40 microns. The synthesised composite casting is machined using EDM to prepare specimens for various tests. Microstructure study was carried and the microstructure images prove the existence and dispersion of reinforcement particles in the metal matrix. There is no visible porosity is observed. The hardness of the specimen is tested using Vickers hardness tester and found considerable increase when compare with parent alloy Al 6061. Also mechanical and tribological properties of hybrid Aluminium metal matrix composite were employed. The fortifying material, Silicon Carbide is composed of tetrahedral of carbon and silicon atoms with strong bonds in crystal lattice along with its excellent wear resistance property and alumina have high strength and wear resistance. To avoid enormous material wastage and to achieve absolute accuracy, wire-cut EDM process is capitalised to engrave the specimen as per required dimensions. Three Tensile test specimens were prepared, in order to achieve reliability in results as per ASTM- E8 standard, and the values were tabulated. Impact test was carried out and the readings were tabulated. Wear test was carried out using pin on disc wear test apparatus and the results show considerable increase in wear resistant property when compare with parent alloy Al6061.The above work proves the successful fabrication of composite and evaluation of properties.

Keywords: composition of reinforcement, EDM, metal matrix.

DOI 10.2412/mmse.30.1.536

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