Dopant effect on high temperature plasticity in oxide ceramics: Grain boundary chemistry-related phenomena

Hidehiro Yoshida, Keijiro Hiraga, Akihide Kuwabara, Takahisa Yamamoto, Yuichi Ikuhara, Taketo Sakuma

    Research output: Contribution to conferencePaperpeer-review

    Abstract

    High temperature plastic deformation in fine-grained oxide ceramics such as alumina and tetragonal zirconia polycrystals is dominantly affected by a small amount of dopant cation. The high-temperature plastic flow in oxide ceramics takes place mainly by grain boundary diffusional creep or grain boundary sliding accommodated by grain boundary diffusion. High-resolution transmission electron microscopy (HRTEM) and an energy-dispersive X-ray spectroscopy (EDS) analysis revealed that the grain boundaries in high-purity oxide ceramics are free from amorphous layer, and that the dopant cations tend to segregate along the grain boundaries. The dopant effect is caused by change in chemical bonding state in the vicinity of the grain boundaries segregated with the dopant cations.

    Original languageEnglish
    Pages269-276
    Number of pages8
    Publication statusPublished - 2005 Dec 1
    EventMaterials Science and Technology 2005, MS and T'05 - Pittsburgh, PA, United States
    Duration: 2005 Sep 252009 May 28

    Other

    OtherMaterials Science and Technology 2005, MS and T'05
    CountryUnited States
    CityPittsburgh, PA
    Period05/9/2509/5/28

    Keywords

    • Alumina
    • Creep
    • Diffusion
    • Grain Boundary
    • Molecular Orbital Calculations
    • Superplasticity
    • Tetragonal Zirconia Polycrystals

    ASJC Scopus subject areas

    • Engineering(all)

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