Abstract
An investigation is reported into the structure and macrosegregation of on eutectic AI-Si alloy solidified using an electromagnetic centrifugal casting process. The effects of external magnetic field and water cooling have been experimentally examined. It is found that the as cast macrostructure is refined both by electromagnetic stirring and by water cooling. As for the microstructures, the electromagnetic stirring causes a change in the silicon morphology from flake to fine dendrite, and produces refined α aluminium dendrites and ‘divorced’ eutectic. The severity of radial macrosegregation in the air cooled eutectic alloy is reduced by application of a magnetic field, whereas that in the water cooled alloy is little influenced by a 0.10 T magnetic field.
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