EVALUATION OF MECHANICAL PROPERTIES OF BORAX AND GRAPHITE BASED AL-6061 COMPOSITES

Nagesh.D, Manjunath S H

Abstract: Aluminium alloys Metal Matrix Composites are readily replacing automobile, industrial, and aerospace components because of their low density, high strength and good structural rigidity. There have been several technical challenges that exist with casting technology. A uniform distribution during the synthesis of these composite reinforcements with the matrix is a most challenging task in casting. The properties of the composites are directly affected by the casting technique. In the present work an attempt has been made to synthesize 6061Al- Graphite-Borax particulate metal matrix composites by liquid metallurgy route (stir casting technique). The addition level of reinforcement is being varied from 3-9 wt% in step of 3wt%. Graphite and Boron was the reinforcement used for enhancing the structural rigidity and weight reduction. Micro structural analysis was carried out to the composites developed by taking specimens from central portion of the casting to ensure homogeneous distribution of particles. Micro-hardness, tensile properties and wear properties of the composites were done as per the standards. Micro structural characterization revealed fairly uniform distribution in the matrix. The tensile strength of the composites was found to increase confirming the dispersed graphite in 6061Al alloy contributed in enhancing the tensile strength of the composites. The wear resistance of the 6061Al-Graphite composite was found to be encouraging for the use in various applications

Keywords: Aluminium 6061, Graphite, Borax, Stir Casting

DOI: https://doi.org/10.15623/ijret.2015.0420003