Abstract
Up to 4 wt% of ultrasonically-pretreated titania and zirconia particles (5μm average size) were dispersed in Al-11.8 wt% Si-1 wt% Mg alloy castings. The technique employed to prepare the cast composites involved mechanically mixing pretreated oxide particles in aluminium alloy melts in the presence of magnesium, followed by casting the resulting mix in permanent moulds. Pretreatment of the oxide particles consisted of agitating the particles in acetone by ultrasonic vibrations to cause the disintegration of agglomerates and the removal of adsorbed water molecules from the particle surfaces. Infra-red (i.r.) spectroscopy of powders showed desorption of water molecules from oxide surfaces by ultrasonic pretreatment in acetone. Ultrasonic pretreatment of oxide particles before their incorporation into the melt and presence of magnesium in the melt were found to be necessary to disperse TiO2 and ZrO2 particles in molten Al. Microscopic studies of the composites indicated dispersed TiO2 and ZrO2 particles which exhibited a reaction zone at the periphery of the particles, and microprobe X-ray elemental analysis confirmed preferential segregation of magnesium at the particle-matrix interface. The composites exhibited an increase in hardness as a result of dispersions of titania and zirconia particles, while the tensile-strength values of composites were comparable with that of the base alloy.
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Banerji, A., Rohatgi, P.K. Cast aluminium alloy containing dispersions of TiO2 and ZrO2 particles. J Mater Sci 17, 335–342 (1982). https://doi.org/10.1007/BF00591467
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DOI: https://doi.org/10.1007/BF00591467