Abstract
A revised model for the halo formation was proposed to modify the previous ones, mainly with regard to the unreasonable estimation of the interdendritic liquid composition. In the present work, the halo formation was explained on the basis of the competitive growth relation between halo and eutectic at the composition of coupled region boundary. Halo formation, therefore, is not confined to nf-f eutectic systems, but can be extended to nf-nf or f-f eutectic systems. The present model was qualitatively examined in Sb-InSb and Sn-Bi eutectic systems. Halo formation was observed to be dependent on growth rate. This growth rate-dependence can be expected in view of its close relation with the composition of coupled region boundary. However, its alloy composition dependence as predicted by the present model was not observed. This unexpected result was also briefly discussed.
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