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The mechanism of the peak in strength and toughness at elevated temperatures in alumina containing a glass phase

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Abstract

The fracture of an alumina containing 5% by volume of glass phase has been studied over the temperature range 20 to 900° C. Peaks in fracture stress andK Ic at elevated temperatures have been confirmed to arise from softening of the glass phase by determining the temperature dependence of the viscosity of a glass of identical composition to that occurring in the ceramic. Observations of fracture surface show glass protrusions at temperatures of the peak in strength orK Ic indicating the viscous stretching of glass particles bridging the opposite crack surfaces and a simple model considering the energy dissipated in this process is presented. The peaks in strength andK Ic arise from this energy dissipation rather than from blunting of the crack.

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Authors and Affiliations

  1. Department of Metallurgy and Science of Materials, Oxford University, Oxford, UK

    C. R. Cheeseman & G. W. Groves

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  1. C. R. Cheeseman
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  2. G. W. Groves
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Cheeseman, C.R., Groves, G.W. The mechanism of the peak in strength and toughness at elevated temperatures in alumina containing a glass phase. J Mater Sci 20, 2614–2622 (1985). https://doi.org/10.1007/BF00556093

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  • DOI: https://doi.org/10.1007/BF00556093

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