Abstract
Hypoeutectic and Hypereutectic aluminium alloys are alloys with compositions below and beyond the eutectic points respectively where aluminium is the major constituent and silicon is the primary alloying element. The silicon content at eutectic point is 12.6% based on which it can be characterized as hypoeutectic and hypereutectic alloys. In the present study the amount of silicon varies between 10 and 16 wt%. Heat treatment enhances or alters the hardness and other mechanical properties of the alloy for better reliability of these alloys. Hence it is proposed to analyze the variation in mechanical, tribological properties and microstructural changes of heat-treated alloys. Tribology studies were conducted based on L9 orthogonal array for two factors: sliding distances and load. 3 levels for each factor were 1 km, 2 km, 3 km sliding distance and 10 N, 20 N and 30 N load and the responses analyzed were wear rate and Coefficient of Friction. The microstructure analysis reveals the grain boundaries and shows the aluminium and primary alloying elements in both the alloys for the heat-treated samples. Hardness test was done to observe the difference between the solution treated and raw samples. The results revealed that the microstructure analysis, hardness and tribological testing of solution heat-treated samples revealed that hypoeutectic alloys have greater hardness than hypereutectic alloys.
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