Solidification microstructure of laser floating zone remelted Al₂O₃/YAG eutectic in situ composite

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• 作者：K. Song ; J. Zhang ; X.J. Jia ; H.J. Su ; ^{shjnpu@yahoo.com.cn} ; L. Liu ; H.Z. Fu
• 关键词：A1. Crystal morphology ; A1. Directional solidification ; A1. Eutectics ; A2. Floating zone technique
• 刊名：Journal of Crystal Growth
• 出版年：2012
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：15 April, 2012
• 卷：345
• 期：1
• 页码：51-55
• 文件大小：686 K

摘要

Alumina based eutectic in situ composite is now considered to be a promising candidate for ultrahigh temperature structural materials due to its excellent performance even close to its melting point. In this work, Laser Floating Zone (LFZ) solidification experiments have been performed on Al₂O₃/Y₂O₃ containing 18.5 mol%Y₂O₃ eutectic in situ composite at growth rate between 8 and 800 渭m/s. The solid/liquid (S/L) interface morphology of this system was reported. Based on the interface morphology, the lamellar selection mechanism of irregular eutectic systems was also discussed. The solidification microstructure evolution was studied, and the characteristic scale of irregular eutectic systems was analyzed using a mathematical model considering non-isothermal interface morphology. An important parameter, 桅, which represents relationship between characteristic scales, was also given.