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Oxide growth stress measurements and relaxation mechanisms for alumina scales grown on FeCrAlY / P. F. Tortorelli in Materials and corrosion, Vol. 63 N° 10 (Octobre 2012) 

Public ISBD [article]  in Materials and corrosion > Vol. 63 N° 10 (Octobre 2012) . - pp. 857–861 Titre : Oxide growth stress measurements and relaxation mechanisms for alumina scales grown on FeCrAlY Type de document : texte imprimé Auteurs : P. F. Tortorelli, Auteur ; E. D. Specht, Auteur ; K. L. More, Auteur Année de publication : 2013 Article en page(s) : pp. 857–861 Note générale : Génie mécanique Langues : Anglais (eng) Mots-clés : FeCrAlY;  high  temperature  oxidation;  oxide  growth  stress Résumé : Early-stage tensile stress evolution in α-Al2O3 scales during oxidation of FeCrAlY at 1000, 1050, 1100, and 1200 °C was monitored in situ by use of synchrotron radiation. Tensile stress development as a function of oxidation temperature indicated a dynamic interplay between stress generation and relaxation. An analysis of the time dependence of the data indicated that the observed relaxation of the initial tensile stress in the oxide scales at 1100 and 1200 °C is dominated by creep in the α-Al2O3. A thin layer of a (Fe,Cr,Al) oxide was observed at the oxide-gas interface, consistent with a mechanism whereby the conversion of (Fe,Cr,Al)2O3 to α-Al2O3 produces an initial tensile stress in the alumina scale. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206760/abstract [article] Oxide growth stress measurements and relaxation mechanisms for alumina scales grown on FeCrAlY [texte imprimé] / P. F. Tortorelli, Auteur ; E. D. Specht, Auteur ; K. L. More, Auteur . - 2013 . - pp. 857–861. Génie mécanique Langues : Anglais (eng) in Materials and corrosion > Vol. 63 N° 10 (Octobre 2012) . - pp. 857–861 Mots-clés : FeCrAlY;  high  temperature  oxidation;  oxide  growth  stress Résumé : Early-stage tensile stress evolution in α-Al2O3 scales during oxidation of FeCrAlY at 1000, 1050, 1100, and 1200 °C was monitored in situ by use of synchrotron radiation. Tensile stress development as a function of oxidation temperature indicated a dynamic interplay between stress generation and relaxation. An analysis of the time dependence of the data indicated that the observed relaxation of the initial tensile stress in the oxide scales at 1100 and 1200 °C is dominated by creep in the α-Al2O3. A thin layer of a (Fe,Cr,Al) oxide was observed at the oxide-gas interface, consistent with a mechanism whereby the conversion of (Fe,Cr,Al)2O3 to α-Al2O3 produces an initial tensile stress in the alumina scale. En ligne : http://onlinelibrary.wiley.com/doi/10.1002/maco.201206760/abstract