MORPHOLOGY OF EUTECTIC Si IN OVER-MODIFIED Al-Si EUTECTIC ALLOY

SEM and EMPA observations were carried out on specimens of high purity Al-12.5%Si eutectic alloy in which certain amount of Na was added. The results indicated that the Al-Si eutectie itself forms cellular and dendritic eutectic colony with the increase of Na added in the Al-Si euteetic alloy.