Mass transfer through a single grain boundary in alumina bicrystals under oxygen potential gradients

Tsuneaki Matsudaira, Satoshi Kitaoka, Naoya Shibata, Tsubasa Nakagawa, Yuichi Ikuhara

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    The mass-transfer behavior through grain boundaries (GBs) in alumina was systematically investigated using four types of alumina bicrystals. The alumina bicrystal wafers were exposed to the constant oxygen potential gradient(ΔPO2)generated by the combination of two different oxygen partial pressures PO2 (II)and PO2 (I) of 105 and 1 Pa, respectively, at 1923 K. Ridges were formed along the GBs on the surface subjected to PO2 (II), and deep GB ditches were developed on the PO2 (I) surface mainly during the migration of aluminum thorough GBs from the PO2 (I) surface to PO2 (II) surface. The surface morphology changes in the vicinity of the GBs were observed by atomic force microscopy. It was found that the surface morphology changes indicative of the aluminum GB diffusion were strongly dependent on the GB characteristics. The GB diffusion coefficients of aluminum estimated from the volume of the GB ridges showed a clear correlation to the local bonding environments of GB cores estimated from theoretical calculations reported previously.

    Original languageEnglish
    Pages (from-to)4407-4412
    Number of pages6
    JournalJournal of Materials Science
    Volume46
    Issue number12
    DOIs
    Publication statusPublished - 2011 Jun 1

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

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