Abstract
The effects of the rotation of mold and electromagnetic stirring on the formation of equiaxed zone of 99.7% aluminum ingots were studied using a graphite mold and a shell mold.It was found that the rotation of mold must be stopped during solidification to get an equiaxed zone of ingots since continuous rotation of mold produced an ingots of entirely columnar structure. Equiaxed crystals were most violently formed when the rotation of mold was stopped in the initial stage of solidification. In the case of electromagnetic stirring of molten metal in the mold, the separation of equiaxed crystals from the mold wall was most effective in the initial stage of solidification before the formation of stable solid skin.It was concluded that the pouring temperature must be adequate to avoid the formation of stable solid skin on the upper region of the mold during the electromagnetic stirring treatment.
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