Influence of Agitation Time on Mechanical and Tribological Behaviour of SiC Strengthened AA6061/Mg/Cu Composite by Liquid State Process
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Abstract
The impact of agitation time is examined in the stir casting process of aluminum-SiC metal matrix composites using copper and magnesium as additives. Mixing 12% wt. SiC reinforcements, 4% wt. magnesium and 2% wt. copper into a melt of 6061 aluminum alloy and agitated with three different timings (5,10 and 15 min.) for producing the composites. Magnesium addition improved the wettability of SiC particles with the Al matrix, strengthened the interfacial bond between the reinforcement and matrix in the process. Copper addition significantly alters the wear behaviour of the composite. The mechanical and tribological properties corresponding to each agitation timings are examined. The composite prepared with 10 minute of agitation time has shown higher strength and hardness, wear resistance than the other composites. The SEM images are taken to study the microstructure of the composites and tested specimen.
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