Al2O3 matrix oxide/oxide composites containing rod-like Ba-β-Al2O3 and equiaxed ZrO2 particles have been successfully synthesized by an in-situ process from a mixture of Al2O3 and BaZrO3 powders. The long-axis direction of rod-like Ba-β-Al2O3 phase is parallel to [1010], while the longitudinal interface between Ba-β-Al2O3 phase and Al2O3 matrix is parallel to (0001) of the Ba-β-Al2O3 phase. The mechanical properties of the composites, such as Vickers hardness and fracture toughness, are enhanced with increasing the sintering temperature. Furthermore, the presence of rod-like Ba-β-Al2O3 particles results in enhancement of fracture toughness of the in-situ synthesized composites due to crack deflection and crack bridging.
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