Abstract
Al2O3/ZrO2 eutectic bulks (20 mm in diameter) with different Y2O3 contents (0–4.5 mol %) were grown using the conventional casting method. Variations in the microstructural characteristics and colony tip growth behavior caused by Y2O3 addition in the central equiaxed grain zone were investigated. As Y2O3 was added to the Al2O3/ZrO2 binary eutectic, except for a decrease in colony size, the colony tip radius reduced drastically and then increased slightly. Colony growth behavior can be well predicted using the Lipton–Glicksman–Kurz (LGK) model. A critical Y2O3 content (0.5–1.1 mol%) exists below which the eutectic colony growth is accelerated owing to the Y2O3 addition, but slowed down otherwise. However, the average interphase spacing and ZrO2 rod diameter inside the colonies varied with Y2O3 content, converse to the growth rate.
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