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Creep in non-ductile ceramics

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Abstract

The effect of a transition in creep behaviour in non-ductile ceramics (i.e. those with limited slip systems available) from diffusion controlled creep, to a mechanism involving non-viscous grain-boundary sliding and localized crack propagation is examined. Localized crack propagation is considered as a transition between diffusional creep and instantaneous fracture, and the fracture strength is used as a guide to predict the conditions necessary for the onset of this high strain-rate creep mechanism. In this way the variation in stress, temperature and grain size dependencies of creep rate reported in the literature for these materials may be explained and experimental evidence in support of the present hypothesis is presented.

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Authors and Affiliations

  1. Department of Metallurgy, University of Strathclyde, Glasgow, UK

    A. Crosby

  2. Department of Metallurgy, UMIST, Manchester, UK

    P. E. Evans

Authors
  1. A. Crosby
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  2. P. E. Evans
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Crosby, A., Evans, P.E. Creep in non-ductile ceramics. J Mater Sci 8, 1759–1764 (1973). https://doi.org/10.1007/BF02403529

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  • DOI: https://doi.org/10.1007/BF02403529

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