Chain structure in the unidirectionally solidified Al₂O₃–YAG–ZrO₂ eutectic composite

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• 作者：Tomoya Nagira ; Hideyuki Yasuda ; Satoshi Takeshima ; Takumi Sakimura ; Yoshiharu Waku ; Kentaro Uesugi
• 关键词：A1. X-ray tomography ; B1. Oxides
• 刊名：Journal of Crystal Growth
• 出版年：2009
• 出版时间：1 July 2009
• 年：2009
• 卷：311
• 期：14
• 页码：3765-3770
• 全文大小：701 K

文摘

Three-dimensional images of the unidirectionally solidified Al₂O₃–YAG–ZrO₂ eutectic composite were obtained by micro-X-ray tomography. Reconstructed three-dimensional images revealed that the frequency of branching of Al₂O₃ and YAG phases in an Al₂O₃–YAG–ZrO₂ ternary eutectic specimen was lower than that of the Al₂O₃ and YAG phases in an Al₂O₃–YAG binary eutectic specimen and that the domain size of branching of the YAG and Al₂O₃ phases was approximately twice as high as the lamellar spacing between the two phases. The ZrO₂ phase was mainly located in the Al₂O₃ phase and at the phase boundaries between Al₂O₃ and YAG, but not in the YAG phase. The branching of the ZrO₂ phase occurred more frequently in comparison with the YAG and Al₂O₃ phases. Chain structures between Al₂O₃/YAG and Al₂O₃/ZrO₂ were formed due to the frequent branching of the three constituent phases.