Abstract
Y 2 O 3 doped Al 2 O 3 /ZrO 2 composites mainly composed of randomly-oriented rod-shaped eutectic grains are prepared by combustion synthesis; within the rod-shaped grains, t-ZrO 2 aligned nano-micron fibers are embedded. The increase of the hardness or strength of the ceramics could be attributed to nano-submicron inter-phase spacing and the refinement of the eutectic grains, whereas high-energy, high-angle boundaries between rod-shaped grains could also introduce strong toughening mechanisms involving crack-bridging and pull-out of rod-shaped grains, crack-bridging and frictionally interlocked effects of α-Al 2 O 3 platelet grains.
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