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

Koji Matsui, Nobukatsu Ohmichi, Michiharu Ohgai, Hidehiro Yoshida, Yuichi Ikuhara

    Research output: Contribution to journalArticle

    55 Citations (Scopus)

    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 Al 3+ 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 facesMn Al2O3-doped Y-TZP and that Y3+ and Al 3+ 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.

    Original languageEnglish
    Pages (from-to)2278-2289
    Number of pages12
    JournalJournal of Materials Research
    Volume21
    Issue number9
    DOIs
    Publication statusPublished - 2006 Dec 27

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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