Title: Orientation dependence of fracture toughness and fatigue crack growth resistance for in-situ A1₂O₃/YAG eutectic composites

Authors: K. Hirano, T. Suzuki, A. Kamei, F. Tamai

Addresses: Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, MITI Namiki 1-2 Tsukuba-shi, Ibaraki-ken 305-8564, Japan. ' Mechanical Engineering Laboratory, Agency of Industrial Science and Technology, MITI Namiki 1-2 Tsukuba-shi, Ibaraki-ken 305-8564, Japan. ' Science University of Tokyo, 2641 Yamazaki Noda-shi, Chiba-ken 278-8510, Japan. ' Industrial Technology Center of Saga, 114 Yaemizo, Nabeshima-cho, Saga-ken 849-0932, Japan

Abstract: MGC materials, which are in-situ single crystal oxide ceramics eutectic composites have many potentialities, such as high-strength, high creep resistance, and high oxidation resistance at ultrahigh temperature. In the New Sunshine Program of Agency of Industrial Science and Technology, a leading research and development has started since FY1998 for three years to apply MGC materials on ultrahigh temperature structural materials for gas turbine system. In this paper, the current activities of the Mechanical Engineering Laboratory in the leading research and development is shown. The influences of solidification direction on fracture toughness and fatigue crack growth resistance for A1₂O₃/YAG eutectic composites are discussed.

Keywords: in-situ eutectic composites; fracture toughness; fatigue crack growth resistance; gas turbines; ceramic composites; high temperature; ultrahigh temperature; melt growth composites; MCG; solidification direction.

DOI: 10.1504/IJMPT.2001.005440

International Journal of Materials and Product Technology, 2001 Vol.16 No.1/2/3, pp.276 - 283

Published online: 01 Oct 2004 *

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