Effect of GeO 2 and NdO 1.5 co-doping on high-temperature ductility in TZP

Translated title of the contribution: Effect of GeO 2 and NdO 1.5 co-doping on high-temperature ductility in TZP

Hitoshi Nagayama, Hidehiro Yoshida, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Superplastic flow behavior in 1 mol%GeO 2 and 1 mol%NdO 1.5 co-doped tetragonal ZrO 2-3 mol%Y 2O 3 polycrystal (3Y-TZP) was examined at 1400°C under an initial strain rate of 1.3 × 10 -4 s -1, 1 mol%GeO 2 or NdO 1.5-doping slightly enhances high-temperature ductility in 3Y-TZP, but 1 mol%GeO 2 and 1 mol%NdO 1.5 co-doped TZP exhibits large elongation to failure of more than 600%. The large ductility in TZP due to Ge 4+ and Nd 3+ co-doping can be explained by reduced flow stress. High-resolution transmission electron microscopy (HRTEM) and energy-dispersive X-ray spectroscopy (EDS) analysis revealed that Y 3+, Ge 4+ and Nd 3+ cations segregate in the vicinity of grain boundaries in the present materials. The segregation width of the dopant cation across the grain boundaries in GeO 2 and NdO 1.5 co-doped TZP is larger than that in GeO 2 or NdO 1.5 singly doped TZP. The reduction of the flow stress due to GeO 2 and NdO 1.5 co-doping is probably related to the increment in the segregation width.

    Translated title of the contributionEffect of GeO 2 and NdO 1.5 co-doping on high-temperature ductility in TZP
    Original languageJapanese
    Pages (from-to)1084-1088
    Number of pages5
    JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
    Volume69
    Issue number12
    DOIs
    Publication statusPublished - 2005 Dec

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry

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