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Structure of special grain boundaries in SiAlON ceramics

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Abstract

The microstructure of hot-pressed samples of the 15 R polytype phase in the Si-Al-O-N system was studied by means of TEM. Emphasis was put on studies of high angle grain boundaries. In this material high angle boundaries of arbitrary orientation usually possess a vitreous grain boundary phase. However, special grain boundaries were found, which were free of any vitreous grain boundary phase. From the orientation relation of the adjacent grains Σ=1 (coherent reflection twin boundary), Σ=7 and Σ=13 boundaries were found. For their explanation a coincidence site lattice (CSL) model was developed for (0001) twist boundaries. By assuming an exponential form for the potential of atomic interaction, the calculation of minimum grain boundary energies for special twist angles was in accordance with the experimental observations.

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Authors and Affiliations

  1. Institut für Werkstoffwissenschaften, Max-Planck-Institut für Metallforschung, Stuttgart, West Germany

    H. Schmid & M. Rühle

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  1. H. Schmid
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  2. M. Rühle
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Schmid, H., Rühle, M. Structure of special grain boundaries in SiAlON ceramics. J Mater Sci 19, 615–628 (1984). https://doi.org/10.1007/BF02403250

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  • DOI: https://doi.org/10.1007/BF02403250

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