Superplastic behavior in GeO2 doped Y-TZP

Junpei Mimurada, Kazutaka Sasaki, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)


    The superplastic behavior in GeO2 doped 2.5Y-TZP was examined, especially, in terms of flow stress and tensile ductility by using high temperature tensile tests, X-ray diffraction analysis and scanning electron spectroscopy. ZrO2-2.5 mol%Y2O3-1.0 mol%GeO2 (TZP-1Ge) exhibits lower flow stress and larger tensile elongation than ZrO2-2.5 mol%Y2O3 (2.5Y-TZP) in a temperature range of 1200 and 1550°C at an initial strain rate of 1.3 × 10-4 s-1. The decrease in flow stress mainly results from enhanced diffusivity with a reduction in superplastic activation energy due to GeO2 addition. The improvement in tensile ductility in TZP-1Ge can also be explained by the enhanced diffusivity. Furthermore, the previous model proposed by Kondo et al. was applied to explain the tensile ductility in TZP-1Ge, however, it could not explain the tensile ductility in TZP-1Ge. It would indicate that the further consideration for the equation is required when applied to the superplastic behavior of TZP-1Ge.

    Original languageEnglish
    Pages (from-to)836-841
    Number of pages6
    JournalMaterials Transactions, JIM
    Issue number8
    Publication statusPublished - 1999 Aug


    • Flow stress
    • Germanium oxide
    • Superplasticity
    • Tensile ductility
    • Tetragonal zirconia polycrystals

    ASJC Scopus subject areas

    • Engineering(all)


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