Abstract
Different weight percentage of B4C particulates reinforced Aluminum Matrix Composites (AMCs) are fabricated by modified stir casting route. The produced AMCs are Friction Stir Welded (FSW) using a four factor five level central composite design matrix. The dry sliding wear properties of nugget zone of the FSW composites were analysed using a pin-on-disc wear testing machine. The presence of B4C particulates and fine grain in the weld nugget improved the wear properties. The relationships between the wear rate of AMCs and friction stir welding process parameters were established using a regression model. The developed regression model was optimised to minimise the wear rate using the Generalised Reduced Gradient (GRG) method. The worn out surface characteristics of welded composites were studied using scanning electron microscopy. The numerous pits, grooves and wear tracks were observed in the microstructure.
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