Abstract
AlPb metal-metal composites have been fabricated by stirring the molten alloy in its liquid immiscible state and casting this dispersion into ingots in permanent mold. The microstructure of the composite ingots show that lead particles are preferentially distributed between the dendrites of αAl, implying the pushing of lead droplets by dendritic solidification front. The particle size distribution of lead show that the range of sizes extends with increase in the stirring speed at both the lower and the upper limits of sizes because the higher shear force breaks the liquid lead droplets and the higher flow velocity counteracts the settling of larger droplets. The nature of the size distribution does not change with lead content in the AlPb composite. The dendrite arm spacing is decreased with increase in the stirring speed.
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