Internal friction behavior of alumina polycrystals with engineered grain boundaries

Kazumi Nakagawa, Giuseppe Pezzotti, Ken'ichi Ota, Yuichi Ikuhara, Hidehiro Yoshida, Taketo Sakuma

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)


    Internal friction of alumina polycrystals with engineered grain boundaries was measured in the low frequency range of the torsional forced-vibration. The maximum shear stress amplitude was 50 MPa. Owing to the very high temperature reached during these experiments (1900 K), internal friction spectra could be detected which reveal new important features of the intrinsic rheological behavior of alumina grain boundaries. The monotonically rising internal friction background and the torsional creep behavior, both of a diffusive origin, were systematically characterized upon modifying the grain-boundary structure of alumina with the addition of selected cation dopants (e.g., Titanium and Lutetium). The combined characterizations of internal friction spectrum and torsional creep rate enabled us to precisely assess the role of different cation dopants on "locking" or promoting the diffusive grain-boundary flow, which governs polycrystal deformation.

    Original languageEnglish
    Pages (from-to)1557-1560
    Number of pages4
    JournalMaterials Transactions
    Issue number7
    Publication statusPublished - 2002 Jul


    • Alumina
    • Cation
    • Dopant
    • Grain boundaries
    • Internal friction
    • Polycrystalline
    • Torsional creep

    ASJC Scopus subject areas

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


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