Anisotropy of Fracture Toughness of Stabilized Zirconia Investigated by Nano-Identation Method

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  • Ito Hideaki
    Graduate School of Environmental Studies, Tohoku University
  • Sato Kazuhisa
    Fracture and Reliability Research Institute, Graduate School of Engineering, Tohoku University
  • Unemoto Atsushi
    Graduate School of Environmental Studies, Tohoku University
  • Hashimoto Shin-ichi
    Graduate School of Environmental Studies, Tohoku University
  • Amezawa Koji
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
  • Kawada Tatsuya
    Graduate School of Environmental Studies, Tohoku University

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<p>Nano-indentation tests with a Vickers-type diamond tip were carried out on the {100} surface of a single crystal of 10 mol% yttria-stabilized zirconia (10YSZ), (Y2O3)0.1(ZrO2)0.9. By changing the contact angle of the indentation tip against the single crystal sample, the fracture toughness of 10YSZ was investigated as a function of the crystal orientation from <100> to <110> on the {100} surface. It was empirically shown that the fracture toughness of 10YSZ is anisotropic. The fracture toughness of 10YSZ was lowest in the direction of <100> among investigated orientations. This result suggests that mechanical failures in 10YSZ may occur preferentially along the direction of <100>.</p>

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