MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Microstructure and High-Temperature Strength of Directionally Solidified Al2O3/YAG Eutectic Composite
Yonosuke MurayamaShuji HanadaYoshiharu Waku
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2003 Volume 44 Issue 9 Pages 1690-1693

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Abstract

The microstructure and crystallographic texture of a directionally solidified Al2O3/YAG eutectic composite were studied by field emission scanning electron microscopy (FE-SEM), electron backscatter pattern (EBSP) method and X-ray diffraction (XRD). The high-temperature strength of the composites was investigated by compression test. The Al2O3/YAG eutectic composite with characteristic microstructure shows highly accumulated texture with preferred growth orientations of ⟨300⟩ for Al2O3 and ⟨420⟩-⟨800⟩ for YAG. The growth directions of Al2O3 are concentrated around ⟨100⟩ and ⟨010⟩ directions in twin-related variants, along the interphase boundaries. The composite strength is dependent on both compression direction and strain rate at 1773 and 1873 K, which is attributable mainly to the strain rate and orientation dependence of strength for constituent Al2O3.

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© 2003 The Japan Institute of Metals and Materials
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