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Effect of alumina-doping on grain boundary segregation-induced phase transformation in yttria-stabilized tetragonal zirconia polycrystal

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Abstract

The microstructure in a small amount of Al2O3-doped Y2O3-stabilized tetragonal zirconia polycrystal (Y-TZP) sintered at 1100–1650 °C was examined to clarify the effect of Al3+ ions segregated at grain boundaries on cubic-formation and grain-growth processes. The sintering rate in Y-TZP was remarkably enhanced by Al2O3-doping. In addition, at temperatures >1500 °C, grain growth remarkably proceeded, and the fraction of the cubic phase increased in comparison with that of undoped Y-TZP. High-resolution electron microscopy and nanoprobe x-ray energy dispersive spectroscopy measurements revealed that no amorphous layer existed along the grain-boundary faces in Al2O3-doped Y-TZP and that Y3+ and Al3+ ions segregated at grain boundaries over widths of ∼10 and ∼6 nm, respectively. At 1100 °C, Al3+ ions started to segregate at grain boundaries, and the segregation peak of Al3+ ions increased as the sintering temperature increased. Cubic-formation and grain-growth behaviors in Al2O3-doped Y-TZP were reasonably interpreted by taking into account the effect of Al3+ ions segregating along grain boundaries.

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Authors and Affiliations

  1. Synthetic Chemicals Production, Tosoh Corporation, Shunan, Yamaguchi, 746-8501, Japan

    Koji Matsui, Nobukatsu Ohmichi & Michiharu Ohgai

  2. National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan

    Hidehiro Yoshida

  3. Institute of Engineering Innovation, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Yuichi Ikuhara

Authors
  1. Koji Matsui
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  2. Nobukatsu Ohmichi
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  3. Michiharu Ohgai
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  4. Hidehiro Yoshida
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  5. Yuichi Ikuhara
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Correspondence to Koji Matsui.

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Matsui, K., Ohmichi, N., Ohgai, M. et al. Effect of alumina-doping on grain boundary segregation-induced phase transformation in yttria-stabilized tetragonal zirconia polycrystal. Journal of Materials Research 21, 2278–2289 (2006). https://doi.org/10.1557/jmr.2006.0274

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  • DOI: https://doi.org/10.1557/jmr.2006.0274

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