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

    研究成果: Conference contribution

    抄録

    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.

    本文言語English
    ホスト出版物のタイトルMaterials Science and Technology 2005 - Proceedings of the Conference
    ページ269-276
    ページ数8
    出版ステータスPublished - 2005 12 1
    イベントMaterials Science and Technology 2005 Conference - Pittsburgh, PA, United States
    継続期間: 2005 9 252005 9 28

    出版物シリーズ

    名前Materials Science and Technology
    1
    ISSN(印刷版)1546-2498

    Other

    OtherMaterials Science and Technology 2005 Conference
    CountryUnited States
    CityPittsburgh, PA
    Period05/9/2505/9/28

    ASJC Scopus subject areas

    • Engineering(all)

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