Effect of GeO2 and NdO1.5 Co-doping on high-temperature ductility in TZP

Hitoshi Nagayama, Hidehiro Yoshida, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to journalArticlepeer-review


    Superplastic flow behavior in 1 mol% of GeO2 and 1 mol% of NdO1.5 co-doped ZrO2-3 mol%Y2O3 (3Y-TZP) was examined at 1400°C under an initial strain rate of 1 × 10-4 s-1. 1 mol% of GeO2 or NdO 1.5-doping slightly enhances high-temperature ductility in 3Y-TZP, but 1 mol% of GeO2 and 1 mol% of NdO1.5 co-doped TZP exhibits large elongation to failure of more than 600% at 1400°C. The large ductility in TZP due to Ge4+ and Nd3+ co-doping can be explained from reduction in the flow stress. High-resolution electron microscopy (HREM) and energy-dispersive X-ray spectrometer (EDS) analysis revealed that Y3+, Ge4+ and Nd3+ cations segregate in the vicinity of grain boundaries in the present materiah. The segregation width of the dopant cation across the grain boundaries in GeO2 and NdO 1.5 co-doped TZP is larger than that in GeO2 or NdO 1.5 singly doped TZP. The reduction in the flow stress due to GeO2 and NdO1.5 co-doping is probably related to the increment in the segregation width.

    Original languageEnglish
    Pages (from-to)2564-2568
    Number of pages5
    JournalMaterials Transactions
    Issue number8
    Publication statusPublished - 2004 Aug


    • Doping effect
    • Energy-dispersive x-ray spectrometer
    • Germanium
    • Grain boundary
    • High-resolution electron microscopy
    • Neodymium
    • Segregation
    • Superplasticity
    • Tetragonal zirconia polycrystal

    ASJC Scopus subject areas

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

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