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Crack-void interaction in polycrystalline alumina

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Abstract

Strength of alumina-void samples have been measured in a four-point bend test. Knoop microhardness indentor was used to introduce controlled surface cracks in sintered alumina containing up to 8 vol % spherical voids for the bend test. It was found that as the volume per cent of voids are increased, the strength remained unchanged as the indented crack interacts with the voids. When strong inclusions are considered, an analysis showed that with increase in volume fraction and decrease in inclusion size, the crack interaction resistance for alumina can be improved significantly.

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  1. D. R. Biswas

    Present address: International Telephone and Telegraph Corporation, 7635 Plantation Road, 24019, Roanoke, VA, USA

Authors and Affiliations

  1. Institute of Gas Technology, IIT Center, 3424 South State Street, 60616, Chicago, IL, USA

    D. R. Biswas

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  1. D. R. Biswas
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Biswas, D.R. Crack-void interaction in polycrystalline alumina. J Mater Sci 16, 2434–2438 (1981). https://doi.org/10.1007/BF01113579

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  • DOI: https://doi.org/10.1007/BF01113579

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