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Microstructure, interfaces and creep behaviour of Al2O3–Sm2O3 (ZrO2) eutectic ceramic composites

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Abstract

New compositions in the melt-grown eutectic ceramics field are investigated for thermomechanical applications. This paper is focused on the Al2O3–Sm2O3–(ZrO2) system. The studied compositions give rise to interconnected microstructures without anisotropy along the growth direction. At variance with the binary eutectic Al2O3–SmAlO3, the homogeneity of the microstructure of the Al2O3–SmAlO3–ZrO2 ternary eutectic is less sensitive to the growth rate. Interfaces between the alumina and perovskite phases are investigated by high-resolution transmission electron microscopy (TEM). They are semi-coherent. In stepped interfaces, the facets are parallel to dense planes of each phase. The steps have a dislocation character and may accommodate both misfits. The ternary eutectic displays a very good creep behaviour with strain rates very close to those obtained on other previously studied eutectics in the Al2O3–RE2O3(RE = Y, Gd, Er)–ZrO2 systems. The deformation micromechanisms are analysed by TEM in the three eutectic phases. After creep, dislocations are present in every phase. The activation of unusual slip systems (pyramidal slip in the alumina phase) shows that high local stresses can be reached. The presence of dislocation networks with low energy configurations is consistent with predominance of dislocation climb processes controlled by bulk diffusion.

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Acknowledgements

The authors thank the Region Ile-de-France for convention SESAME 2008 E1845, which supports the JEOL ARM 200F electron microscope installed at MPQ (UMR7162), and Guillaume Wang for his kind assistance on the microscope. This work is supported by the Agence Nationale pour la Recherche through the CINATRA Project ANR-12-RNMP-0008, the METSA network and the European 7th framework program ‘‘ESTEEM2’’. Michael Walls from the Laboratoire de Physique des Solides of the University Paris XI in Orsay (France) is gratefully acknowledged for his reading of the manuscript.

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  1. Institut de Chimie et des Matériaux Paris-Est, UMR 7182 CNRS-Université Paris Est, 2-8 rue H. Dunant, 94320, Thiais, France

    Laura Londaitzbéhère, Sylvie Lartigue-Korinek & Leo Mazerolles

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  1. Laura Londaitzbéhère
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Correspondence to Sylvie Lartigue-Korinek.

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Londaitzbéhère, L., Lartigue-Korinek, S. & Mazerolles, L. Microstructure, interfaces and creep behaviour of Al2O3–Sm2O3 (ZrO2) eutectic ceramic composites. J Mater Sci 52, 5489–5502 (2017). https://doi.org/10.1007/s10853-016-0726-6

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