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Licensed Unlicensed Requires Authentication Published by De Gruyter May 31, 2013

High-temperature deformation behavior of nanocrystalline precursor-derived Si–B–C–N ceramics in controlled atmosphere

  • Ravi Kumar , R. Mager , F. Phillipp , A. Zimmermann and G. Rixecker


In precursor-derived nanocrystalline Si–B–C–N materials, grain or interphase boundaries constitute a major part of the material. They control various properties of nanostructured solids, e.g., by forming fast diffusion pathways. In such highly covalent materials, where the interfaces between the individual crystallites or domains tend to be broadened and structurally disordered, high-temperature plastic deformation (i.e., the creep behavior) can be used as a probe which is particularly sensitive to processes involving internal interfaces and glass-like features of the microstructure. The focus of the present study is an investigation of the deformation behavior of precursor-derived nanocrystalline Si–B–C–N ceramics in the phase-separated amorphous and nanocrystalline states under inert atmospheres. A concise analysis of creep mechanisms free of any oxidation effects was carried out. Isothermal compression creep experiments at 1400°C and at various loads (50MPa–150MPa) have indicated a stress exponent near to unity hinting diffusion creep, and an activation energy of 0.16 ± 0.03 MJ/mol was derived from temperature change experiments under an iso-stress condition. The mechanisms of deformation are elucidated using a free volume model.

* Correspondence address: Dr. rer. nat. Ravi Kumar, Max-Planck-Institut für Metallforschung and, Institut für Nichtmetallische Anorganische Materialien, Universität Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstr. 5, D-70569 Stuttgart, Germany, Tel.: +497116893108, Fax: +497116893131. E-mail:

Dedicated to Professor Dr. Fritz Aldinger on the occasion of his 65th birthday


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Received: 2005-11-15
Accepted: 2006-2-10
Published Online: 2013-05-31
Published in Print: 2006-05-01

© 2006, Carl Hanser Verlag, München

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