Tailoring the morphology in Y₂O₃ doped melt-grown Al₂O₃/ZrO₂ eutectic ceramic

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• 作者：Liansheng Fu^a ; Xuesong Fu^a ; Guoqing Chen^a ; ^{gqchen@dlut.edu.cn} ; Wen-bo Han^b ; Wenlong Zhou^a
• 关键词：Eutectic ceramic ; Al2O3/ZrO2(Y2O3) ; Crystal growth ; Constitutional supercooling
• 刊名：Scripta Materialia
• 出版年：2017
• 出版时间：1 March 2017
• 年：2017
• 卷：129
• 期：Complete
• 页码：20-24
• 全文大小：961 K
• 卷排序：129

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.