Microstructure and orientation of quasi-unidirectionally solidified A1₂O₃/YAG eutectic composites
by Satoshi Takata, Shunkichi Ueno, Yasuhiro Tanabe, Jose M. Calderon, Masahiro Yoshimura, Eiichi Yasuda
International Journal of Materials and Product Technology (IJMPT), Vol. 16, No. 1/2/3, 2001

Abstract: Unidirectionally solidified A1₂O₃/YAG (Y₃A₁₅O₁₂) eutectic composites prepared by the Bridgman method have a preferable orientation relationship with equilibrium boundaries between A1₂O₃ and YAG phases. The microstructure of a quasi-unidirectionally solidified A1₂O₃/YAG eutectic composite was investigated to reveal the formation of the equilibrium boundary at early stages of the solidification. At the first stages of solidification, no specific orientation of A1₂O₃ and YAG phases along the direction of the thermal gradient existed. During progress of the solidification, A1₂O₃ phase gradually orientated to a certain crystallographical direction along the thermal gradient, and then YAG phase orientated to a certain crystallographical direction with respect to the A1₂O₃ phase. In the next stage of the solidification, the eutectic lamellar structure is arranged along the thermal gradient, and the characteristic crystallographic orientation relationships between A1₂O₃ and YAG along the thermal gradient are identified.

Online publication date: Fri, 01-Oct-2004

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