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Transmission Electron Microscopy (TEM) Studies of Interfaces in TiB2-ZrO2 Composites

Published online by Cambridge University Press:  10 February 2011

S. Stemmer ,
J. Vleugels  and
O. Van Der Biest
S. Stemmer
Affiliation:
Department of Metallurgy and Materials Engineering (MTM), Katholieke Universiteit Leuven, de Croylaan 2, B-3001 Leuven, Belgium
J. Vleugels
Affiliation:
Department of Metallurgy and Materials Engineering (MTM), Katholieke Universiteit Leuven, de Croylaan 2, B-3001 Leuven, Belgium
O. Van Der Biest
Affiliation:
Department of Metallurgy and Materials Engineering (MTM), Katholieke Universiteit Leuven, de Croylaan 2, B-3001 Leuven, Belgium
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Abstract

TEM studies of the microstructure and of chemical reactions at interfaces in TiB2-ZrO2 composites are presented. Samples with 70 vol% of Y2O3-stabilized ZrO sintered at 1700 °C showed reaction zones around the TiB2 grains, that consisted of a solid-solution of TiO2 and ZrO2(Y2O3). In addition, nontransformable, tetragonal t'-ZrO2 was observed in these samples. In contrast, the interphase boundaries in composites sintered at 1450 °C contained no reaction products, and the ZrO2 matrix consisted of small, transformable tetragonal grains, as required for transformation toughening of the composites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 458: Symposium W – Interfacial Engineering for Optimized Properties , 1996 , 133
Copyright
Copyright © Materials Research Society 1997

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References

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