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Anelastic behavior of precursor-derived amorphous ceramics in the system Si–B–C–N

Published online by Cambridge University Press:  31 January 2011

Martin Christ ,
André Zimmermann  and
Fritz Aldinger
Martin Christ
Affiliation:
Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universitát Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, 70569 Stuttgart, Germany
André Zimmermann
Affiliation:
Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universitát Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, 70569 Stuttgart, Germany
Fritz Aldinger
Affiliation:
Max-Planck-Institut für Metallforschung and Institut für Nichtmetallische Anorganische Materialien, Universitát Stuttgart, Pulvermetallurgisches Laboratorium, Heisenbergstrasse 5, 70569 Stuttgart, Germany
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Abstract

The objective of this paper is to report on the anelastic, i.e., reversible and time-dependent, deformation behavior of precursor-derived amorphous ceramics. Therefore compression experiments under constant and varying stresses up to 250 MPa were performed at a temperature of 1400 °C. In the stress change experiments anelasticity was observed. By comparison of both types of experiments, the anelastic strain rate was determined. It decreased inversely proportional to the time after the stress change and was independent of the preceding duration of the test. Furthermore, deviations from the deformation behavior expected according to the free-volume-model, which were observed in compression creep tests, could be explained by anelastic behavior.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 7 , July 2001 , pp. 1994 - 1997
Copyright
Copyright © Materials Research Society 2001

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