Temperature Dependence of Static and Cyclic Fatigue Behavior of Al2TiO5 Ceramics

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Static and cyclic fatigue of aluminum titanate (Al2TiO5: AT) ceramics, which contain many microcracks at their grain boundaries as a result of a large thermal expansion anisotropy during cooling after sintering, were investigated at room temperature and 700°C. The fatigue lifetime is related to the morphological changes of the microcracks. The fatigue lifetimes at room temperature and 700°C decreased when a cyclic stress was applied, and was much shorter at room temperature. During cyclic fatigue at room temperature, the microcracks around the main crack tip are thought to combine and propagate according to crack resisting-reactivating and wedging-microcracking mechanisms. In contrast, cyclic fatigue at 700°C is thought to be accelerated by the wedging effect of the glassy connections behind the crack tip. The microcracks underwent repeated initiation and self-healing via a glassy phase segregated at the grain boundaries.
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