Abstract
Containerless solidification of Y 3Al 5O 12 garnet (YAG) was carried out using an aero-acoustic levitator to elucidate the solidification process beyond the hypercooling limit (Δ T hyp). A YAG melt was seeded at different undercoolings by a SiO 2 trigger needle. The apparent plateau after recalescence disappeared at around Δ T=500 K and the post-recalescence temperature ( T post) decreased from the melting point with further increase in undercooling. Δ T hyp of YAG was estimated to be 769 K using the specific heat of liquid that was evaluated by a heat-transfer calculation from the obtained cooling curves. T post decreased before reaching the estimated Δ T hyp. Although this behavior was ascribed to heat extraction by the levitation gas, which suggests that the YAG melt did not solidify adiabatically due to the low thermal conductivity, the maximum undercooling of 1060 K indicates that the YAG melt solidified beyond Δ T hyp. Moreover, the cellular morphology of YAG was observed even beyond Δ T hyp. It can be seen that the cellular morphology is retained since the thermal supersaturation does not reach unity at Δ T hyp due to the large kinetic effect.
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