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Crystallization of grain boundary phases in hot-pressed silicon nitride materials

Part 2 Mechanical properties of materials

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Abstract

The mechanical properties of hot-pressed silicon nitrides containing crystalline magnesium silicate phases were investigated at room temperature and at elevated temperatures. Scanning electron microscopy of fracture surfaces was used to identify the fracture-initiating flaws at room temperature and the modes of fracture at higher temperatures. The mechanical properties of these materials at elevated temperatures were interpreted in terms of a subcritical crack growth mechanism involving grain boundary sliding, which implied the presence of residual glass phases at the grain boundaries.

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Author notes

  1. J. E. Weston

    Present address: Department of Metallurgy and Materials Science, University of Cambridge, Pembroke Street, Cambridge, UK

Authors and Affiliations

  1. Department of Metallurgy and Materials Science, Imperial College of Science and Technology, London, UK

    J. E. Weston & P. L. Pratt

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  1. J. E. Weston
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  2. P. L. Pratt
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Weston, J.E., Pratt, P.L. Crystallization of grain boundary phases in hot-pressed silicon nitride materials. J Mater Sci 13, 2147–2156 (1978). https://doi.org/10.1007/BF00541668

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  • DOI: https://doi.org/10.1007/BF00541668

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