Orientation dependence of fracture toughness and fatigue crack growth resistance for in-situ single crystal oxides ceramics eutectic composites

摘要

In-situ single crystal oxides ceramics eutectic composites, Al{sub}2O[sub]3/Y{sub}3Al{sub}5O{sub}12(YAG), Al{sub}2O{sub}3/GdAlO{sub}3 (GAP) and Al{sub}2O{sub}3/ Er{sub}3Al{sub}5O{sub}12 (EAG) have many potentialities as the ultra-high temperature structural material as. They also have good productivity of complex structural components as compared with conventional sintered ceramics. In this paper, fracture toughness and cyclic fatigue crack growth resistance was evaluated as a fundamental materials performance in a comparison with a conventional sintered Al{sub}2O{sub}3 ceramic. It is found that there is a remarkable dependence of specimen orientation.