Al 2 O 3 /ZrO 2 (Y 2 O 3 ) pseudo-binary eutectic melt may solidify in the dendritic form at the low G/v ratio (thermal gradient G divided by growth rate v) associated with the Y 2 O 3 microsegregation along the monovariant line. Especially, in the system with high Y 2 O 3 content (≥4.5 mol%), an Al 2 O 3 /ZrO 2 /YAG ternary eutectic in situ microstructure growing with a "plane front" will appear at the boundaries of dendritic structures. The volume fraction of the ternary eutectic increases with the increase in Y 2 O 3 content. It was found that the amount of ternary eutectic can be well predicted by the Scheil equation (or nonequilibrium lever rule).
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