Abstract
Y3Al5O12 (YAG) is the most creep-resistant single crystal oxide known and is therefore an attractive candidate for very high temperature applications. The fracture toughness, K1c, was measured as a function of temperature using the single edge precracked beam (SEPB) method and was compared to notched beam method results in the literature. The fracture toughness of annealed SEPB specimens was found to be independent of both temperature from 20°C to at least 1700°C and loading rate over two orders of magnitude. Thus the brittle-to-ductile transition does not occur before 1700°C. Previous reports of remarkable increases in the fracture toughness below 1700°C using notched beam methods are considered erroneous due to microcrack healing and crack blunting effects. The SEPB fracture toughness method avoids these problems since a long, sharp crack exists in the specimen prior to testing and can be effectively preserved at high temperatures using a preloading procedure. © 1997 Acta Metallurgica Inc.
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