Aluminum titanate ceramics (Al2TiO5) is a synthetic ceramic material of potential interest for
many structural applications. A critical feature, which greatly limits the mechanical properties of polycrystalline
Al2TiO5, is considerable intergranular microcracking, which occurs due to the high thermal
anisotropy of individual grains. In this study, the temperature dependencies of mechanical properties were
discussed along with the microstructure observation. Both of fracture strength and fracture toughness
increased considerably with increasing the temperature. These phenomena were explained on the basis of
the stress redistribution and unique microscopic feature on the fracture surface of aluminum titanate
ceramics. The experimental results also revealed that the repeated heat treatments resulted in the change
of fracture strength and fracture toughness due to the stress redistribution in the Al2TiO5 matrix.