Surface grinding and polishing ZrO//2 prime s tetragonal-to-monoclinic transformation resulted in residual compressive surface stress in the ZrO//2-toughened Al//2O//3 (ZTA) ceramics. When the surface stress was removed by annealing the specimens at 1350 degree C for 1 h, the fracture toughness (K//i//c) values determined by Vickers indentation technique were independent of the Vickers load. But with the as-polished specimens, the K//i//c appeared larger and strongly dependent on the Vickers load, because the surface stress impeded the crack extension.
|Number of pages||2|
|Journal||Yogyo Kyokai Shi/Journal of the Ceramic Society of Japan|
|Publication status||Published - 1984 Dec 1|
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