Abstract
We studied rheocasting of an A357 (Al-7Si-0.6Mg) alloy using the Rapid Slurry Formation (RSF) technology developed by Rheometal. The technology is based on a so-called solid enthalpy exchange material (EEM). Semi-solid slurries of A357 with around 30% solid fraction were produced in this way. The slurry formation was modified by adding several grain refiners (Al-5Ti-1B, Al-3Ti-0.15C and Si-1B master alloys) individually. Stirring speed was varied to study its effect on microstructure. The slurry so produced was air cooled and quenched in water. It was observed that rapid heat extraction, nucleation and forced shearing action developed globular α-Al phase.
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