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Microcracks with unexpected characteristics induced by CTE mismatch in two-phase model materials

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Abstract

In order to study model microstructures representative of industrial refractory materials, this work is devoted to the elaboration and microstructural characterisation of two-phase model materials able to develop interfacial damage by thermal expansion mismatch between the matrix and inclusions. The studied materials are composed of a vitreous matrix surrounding dense alumina balls (Al2O3 99.9%). As expected, because of the not null dilatometric dissension (Δα < 0 with αmatrix < αinclusions), all the samples exhibit partial decohesions at the matrix-inclusions interfaces. But one also observes the presence of two types of unexpected cracks: straight cracks in the median plane between two inclusions and circular cracks around inclusions. Numerical, analytical and experimental tools were used to study the origin of such unexpected defects.

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Acknowledgements

Yoann Joliff would like to express his gratitude towards the Limousin Region and the European Social Fund for financial support of the present work.

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Authors and Affiliations

  1. GEMH, Ecole Nationale Supérieure de Céramique Industrielle, 47 à 73 avenue Albert Thomas, 87065, Limoges cedex, France

    Yoann Joliff, Joseph Absi, Marc Huger & Jean Claude Glandus

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  1. Yoann Joliff
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  2. Joseph Absi
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  3. Marc Huger
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  4. Jean Claude Glandus
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Correspondence to Yoann Joliff.

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Joliff, Y., Absi, J., Huger, M. et al. Microcracks with unexpected characteristics induced by CTE mismatch in two-phase model materials. J Mater Sci 43, 330–337 (2008). https://doi.org/10.1007/s10853-007-1691-x

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  • DOI: https://doi.org/10.1007/s10853-007-1691-x

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