Structure and strength of grain boundaries in Si bicrystals with 〈111〉 twist misorientations

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

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    6 Citations (Scopus)


    In order to determine the relationship between structure and strength of grain boundaries in Si, bicrystals with 111 direction twist boundaries were prepared from 6 N high-purity Si single crystals by press-joining. Fracture strength was measured by 3-point bending test and observed by TEM. 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 weaker than the prediction. The measured grain-boundary energy depends on the twist angle in the same way as the fracture strength. 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)536-542
    Number of pages7
    JournalNippon Kinzoku Gakkai-si
    Issue number5
    Publication statusPublished - 1989 May 1

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Metals and Alloys
    • Materials Chemistry


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