Synthesis of fly ash particle reinforced A356 Al composites and their characterization

A356 Al-fly ash particle composites were fabricated using stir-cast technique and hot extrusion. Composites containing 6 and 12 vol.% fly ash particles were processed. Narrow size range (53-106 mu m) and wide size range (0.5-400 mu m) fly ash particles were used. Hardness, tensile strength, compressive strength and damping characteristics of the unreinforced alloy and composites have been measured. Bulk hardness, matrix microhardness, 0.2% proof stress of A356 Al-fly ash composites are higher compared to that of the unreinforced alloy. Additions of fly ash lead to increase in hardness, elastic modulus and 0.2% proof stress. Composites reinforced with narrow size range fly ash particle exhibit superior mechanical properties compared to composites with wide size range particles. A356 Al-fly ash MMCs were found to exhibit improved damping capacity when compared to unreinforced alloy at ambient temperature. (c) 2007 Elsevier B.V. All rights reserved.