Characterization of spray formed and cold rolled Al-Pb alloy

Abstract

The Al-Pb alloys were spray formed in the form of a disc shape by using the nozzle and their characteristics such as microstructure, porosity, hardness wear etc were studied. The spray droplets were deposited over a copper substrate to achieve a disc shape perform. The porosity, hardness, wear and micro structural studies of the Al-Pb spray deposited alloys were conducted for 20% lead content in aluminum after the cold rolling process for 20%, 40%, 60% and 80% of the thickness reduction from the top to peripheral region and Optical micrographs were taken for the samples with different percentage of thickness reduction from top to peripheral regions. In scanning electron micrograph the grain boundaries were clear with the 20% of the lead content and max amount of lead content was distributed along the grain boundaries. The lead was uniformly dispersed in the deposit as revealed by colour dot map. The surface porosity and total porosity increases with increase in the percentage of the reduction in thickness of the samples. The hardness increased in middle and peripheral regions due to increase in the percentage of reduction in thickness of the samples. Friction and wear testing of spray formed alloys were investigated using a pin on disc type wear testing machine.wear rate behaviour with applied load was observed.