Incorporation of Alumina Particles in Aluminium-Magnesium Alloy by Stirring in Melt

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Abstract
The impact of process parameters like temperature, the dimension and the position of an impeller on the incorporation of Al2O3 particles in cast Al–Mg alloy has been investigated. The maximum incorporation level of Al2O3 particle is achieved by dispersing the Al2O3 particles in the semi-solid alloy by the impeller with a diameter 0.63 times as large as that of the crucible at stirring speed of 16 revol. s−1. The optimal position of the impeller has been found to be 0.81 times as large as the depth of the liquid at rest from the bottom of the crucible. Incorporation of Al2O3 particles increased with the decrease of melt temperature between the solidus and the liquidus temperature under given stirring speed, dimension and position of the impeller. Model experiments have been conducted with water and poorly wetting plastic beads, in order to find an explanation for the role of the above variables. An estimate of the porosity in the cast alloy indicates a linear increase with the amount of Al2O3 particles incorporated.

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