Preparation and investigation of wear and corrosion behaviour of Al 7475/ CSA/Graphite hybrid metal matrix composites

Abstract

ABSTRACT The Aluminium Metal Matrix Composites are preferred in automotive and aerospace industries for higher strength to weight ratio, good corrosion resistance, and also for better tribological properties. Aluminium improves its qualities by adding reinforcements like fly ash, silicon carbide, tungsten carbide, boron carbide, and ceramic fired bricks. Stir casting is the most common and cost-effective method for processing and creating metal matrix composites, and it is dependent on the processing parameters, reinforcement, and matrix choices. In this investigation stir casting method was used to prepare composites by using Al7475 alloy with preheated reinforced particles of CSA and Graphite. The successful distribution of reinforcements in the Al7475 matrix was confirmed by SEM images of AMMCs and the improved wear and corrosion resistance of AMMC was revealed by the corresponding test results. At 3% Gr and 30N load, the wear rate reduction is 38.4% at 600 rpm, 50.6% at 800 rpm, and 69.4% at 1000 rpm. The highest corrosion rate reduction is possible with 9 % of graphite in CSA composite is 58 %.