文摘
The addition of more components are an interesting way of the microstructural controls. Herein, adding Y2O3 to Al2O3-ZrO2 bulk eutectic at the low G/v ratio (thermal gradient G divided by growth rate v) was adopted to tailor the morphology. As the Y2O3 content increases, the solidification structure changes obviously from cellular into the dendritic shape. Especially, a typical irregular Al2O3/ZrO2/Y3Al5O12 (YAG) ternary eutectic appeared in the inter-colony region for the higher Y2O3 content. This microstructure transition is consistent with the classical constitutional supercooling criterion.