Abstract
Used as fuel cladding in the Gen IV fission reactors, ODS steels would be held at temperatures in the range of 350°C to 600°C for several months. Under these conditions, spinodal decomposition is likely to occur in the matrix, resulting in an increase of material brittleness. In this study, thin films consisting of a modulated composition in Fe and in Cr in a given direction have been elaborated. The time evolution of the composition profiles during aging at 500°C has been characterized by atom probe tomography, indicating an apparent kinetic stasis of the initial microstructure. A computer model has been developed on the basis of the Cahn–Hilliard theory of spinodal decomposition, associated with the mobility form proposed by Martin (1990). We make the assumption that the initial profile is very close to the amplitude-dependent critical wavelength. Our calculations show that the thin film is unstable relative to wavelength modulations, resulting in the observed kinetic stasis.
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Acknowledgements
Maxime Bertoglio and Marion Descoins are acknowledged for technical support. The authors wish to thank M. Nastar and F. Soisson for fruitful discussions. This work was supported by the joint program CPR ODISSEE funded by AREVA, CEA, CNRS, EDF, and Mécachrome under contract 070551.
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Maugis, P., Colignon, Y., Mangelinck, D. et al. Spinodal Decomposition in Multilayered Fe-Cr System: Kinetic Stasis and Wave Instability. JOM 67, 2202–2207 (2015). https://doi.org/10.1007/s11837-015-1558-6
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DOI: https://doi.org/10.1007/s11837-015-1558-6