Low-temperature superplasticity in nanocrystalline tetragonal zirconia polycrystal (TZP)

Hidehiro Yoshida, Koji Matsui, Yuichi Ikuhara

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    Nanocrystalline tetragonal ZrO 2 polycrystals (TZP) have been fabricated by the pressureless sintering of recently developed tetragonal ZrO 2 powder containing 5.69 mol% YO 1.5 and 0.60 mol% AlO 1.5. The average grain sizes were 160 nm in the TZP sintered at 1150°C for 10 h and 150 nm in the 0.25 mol% GeO 2-doped TZP sintered at 1100°C for 100 h. The TZP and Ge 4+-doped TZP-sintered bodies were essentially single-phase materials, and neither the amorphous layer nor the second-phase particle was observed along the grain boundary faces. High-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM), and nanoprobe energy-dispersive X-ray spectrometer (EDS) measurements revealed that the Y 3+, Al 3+ and Ge 4+ cations tend to segregate in the vicinity of the grain boundaries in the TZP-sintered bodies. The TZP and Ge 4+-doped TZP exhibited an elongation to failure of more than 100% in the temperature range of 1150°C-1300°C and initial strain rate range of 1.4 × 10 -5 s -1 to 1.0 × 10 -2 s -1. For instance, an elongation to failure in the Ge-doped TZP reached about 200% at 1150°C and 1.4 × 10 -5 s -1. The nanocrystallization reduced the lower limit of the superplastic temperature of conventional, submicron-grain TZP materials by 150°C. The improved ductility of the TZP at low temperatures was essentially attributed to the reduced grain size.

    Original languageEnglish
    Pages (from-to)1701-1708
    Number of pages8
    JournalJournal of the American Ceramic Society
    Volume95
    Issue number5
    DOIs
    Publication statusPublished - 2012 May 1

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Geology
    • Geochemistry and Petrology
    • Materials Chemistry

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