Abstract
Fracture and fatigue experiments have been conducted on liquid phase bonded (LPB) and solid-state bonded (SSB) aluminum-alumina interfaces. The LPB interfaces contain voids and dendritic FeAl3 precipitates, whereas SSB interfaces are relatively defect-free. These precipitates result in local embrittlement, yet both interfaces are strong and tough. Upon cyclic loading, mode 1 cracks in both systems grow alternately along the interface and within the A1. The development of a tortuous crack path elevates the apparent fatigue threshold through crack closure. Under mixed mode loading, fatigue cracks approaching SSB interfaces propagate through the A1 rather than along the interface. Conversely, for LPB interfaces, mixed mode cyclic crack growth along the interface occurs in preference to propagation in the A1. Correlation between the striation spacing and the crack tip opening displacement suggests a growth mechanism based on crack tip blunting.
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