Microstructural and dry sliding friction studies of aluminum matrix composites reinforced pks ash developed via friction stir processing

Abstract

Constant search for materials with superior strength to weight ratio as well as high temperature resistance has triggered a keen interest on aluminum matrix composites (AMCs) for potential application in aerospace and automotive industry. For the sake of clean environment and low cost, industrial and agricultural wastes are been adopted in the production of AMCs. Friction stir processing technique was used to develop aluminum matrix composites with palm kernel shell (pks) ash particles as reinforcement. Microstructure examination was done with the aid of an optical microscope and the captured micrographs show a well imbedded and evenly distributed PKS ash powder into the aluminum substrate. Obtained micro hardness values show improvement from the beginning to the end of the process with Vickers hardness of 31.74 (Middle) and 36.11 (End). A pin on disc tribometer was used for friction testing while considering effect of load, 1 and 10 N namely. The experimental analysis of the friction gave mean value of 0.862 and 0.828 respectively for the two loads considered. Microstructural investigation revealed a homogenous distribution of the pks ash particles into the metal substrate.