Abstract
Single crystal eutectic composites have recently been researched and developed as the bulk materials. They are generally expected to be the most interesting and attractive as the high temperature, environmental resistant structural material in the field of aeronautics, aerospace and power generator technologies. They have high temperature strength characteristics, high creep and oxidation resistance as well as the fairly good machinability and manufacturability. An overview provides explain the National project of application of eutectic composites for 1700 °C-class gas turbine system that does not require thermal and environmental barrier coatings. Pure mode-I and -II, mixed-mode fracture toughness are investigated up to 1700 °C in air to determine materials reliability and also discussed fatigue crack growth characteristics in relation to materials durability. Key technical issues are summarized with prospects for a wide practical application.
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