Structure and Strength of Grain-Boundaries in Si Bicrystals with <111> Twist Misorientations

Kazuaki Sato, Kazuaki Sato, Hirokazu Miyazaki, Hirokazu Miyazaki, Yuichi Ikuhara, Yuichi Ikuhara, Hiroaki Kurishita, Hiroaki Kurishita, Hideo Yoshinaga

    Research output: Contribution to journalArticlepeer-review

    9 Citations (Scopus)

    Abstract

    In order to determine the relationship between structure and strength of grain-boundaries in Si bicrystals with <111> twist boundaries were prepared from 6N high-purity Si single crystals by press-joining, and their fracture strength was measured by 3-point bending test and the structure was observed by TEM. The results obtained are as follows. (1) The fracture strength depends on the twist angle in a similar manner as predicted theoretically by Inomata et al. without any consideration of the relaxation of boundary structure. However, the observed misorientation-dependence is much weaker than the prediction. (2) The measured grain-boundary energy depends on the twist angle in the same way as the fracture strength. (3) The boundary extension is too small to be observed. These results are compared with those of covalent-bonded SiC and refractory metal Mo, and the cause of the boundary extension observed in SiC and Si3N4 is discussed.

    Original languageEnglish
    Pages (from-to)865-872
    Number of pages8
    JournalMaterials Transactions, JIM
    Volume31
    Issue number10
    DOIs
    Publication statusPublished - 1990

    Keywords

    • extended grain-boundary
    • fracture strength
    • grain-boundary
    • grain-boundary energy
    • joining
    • misorientation
    • silicon bicrystal
    • twist boundary

    ASJC Scopus subject areas

    • Engineering(all)

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