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In situ characterization of ion-irradiation enhanced creep of third generation Tyranno SA3 SiC fibers

Published online by Cambridge University Press:  10 February 2015

Juan Huguet-Garcia*
Affiliation:
CEA, DEN, Service de Recherches Métallurgiques Appliquées, F-91191 Gif-sur-Yvette, France
Aurélien Jankowiak
Affiliation:
CEA, DEN, Service de Recherches Métallurgiques Appliquées, F-91191 Gif-sur-Yvette, France
Sandrine Miro
Affiliation:
CEA, DEN, Service de Recherches de Métallurgie Physique, Laboratoire JANNUS, F-91191 Gif-sur-Yvette, France
Thierry Vandenberghe
Affiliation:
CEA, DEN, Service de Recherches Métallurgiques Appliquées, F-91191 Gif-sur-Yvette, France
Clara Grygiel
Affiliation:
CIMAP, CEA-CNRS-ENSICAEN-UCBN, BP 5133, 14070 Caen Cedex 5, France
Isabelle Monnet
Affiliation:
CIMAP, CEA-CNRS-ENSICAEN-UCBN, BP 5133, 14070 Caen Cedex 5, France
Jean-Marc Costantini
Affiliation:
CEA, DEN, Service de Recherches Métallurgiques Appliquées, F-91191 Gif-sur-Yvette, France
*
a)Address all correspondence to this author. e-mail: juan.huguet-garcia@cea.fr
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Abstract

Subcritical crack growth in SiC based composites is controlled by fiber creep processes. This lifetime limiting mechanism is of special concern under irradiation as it can enhance creep related mechanisms. To evaluate the impact of irradiation on the mechanical behavior of Tyranno SA3 fibers, in situ tensile tests were conducted on single fibers. These tests were conducted under irradiation with 92 MeV Xe23+ ions at 1000 °C for different ion fluxes and stress loads using a dedicated experimental facility. It has been found that irradiation induces time-dependent deformation of the fibers under conditions where thermal creep is negligible, i.e., 300 MPa and 1000 °C. Irradiation strain rate shows linear dependence with the ion beam flux and square root dependence with the applied stress. Finally, the irradiation creep compliance is estimated to be 1.01 × 10−5 MPa−1 dpa−1.

Type
Articles
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Khalid Hattar

References

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