Abstract
Cu-8 wt.%Al eutectic alloy was undercooled by up to 187 K(0.14 TE) using a drop tube technique. The crystal growth andphase selection mechanisms were investigated during containerless rapidsolidification. It is found that the microstructural morphology ischaracterized by lamellar eutectic growth at small undercoolings.However, if the liquid alloy is undercooled by more than 25 K, eutecticgrowth will be suppressed completely and the dendritic growth of (Cu)solid solution dominates its solidification process. When theundercooling exceeds 153 K, a microstructural transition from coarsedendrite to equiaxed dendrite takes place.
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