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Creep flow and fracture behavior of the oxygen-enriched alpha phase in zirconium alloys

Abstract : During hypothetical Loss-Of-Coolant-Accident (LOCA) scenario, zirconium alloy fuel cladding tubes are exposed to internal pressure and high temperature oxidation, so that an oxygen-stabilized α(O) phase, forms from the outer surface of the cladding, under the zirconia oxide layer. The high-temperature viscoplastic flow and fracture behavior of the α(O) phase were characterized through axial creep tests performed under vacuum, on representative model materials containing 10–30 at.% of oxygen. Creep strengthening and ductile-to-brittle transition were quantified as a function of oxygen content and test temperature, and modeled into viscoplastic flow constitutive equations and an empirical fracture criterion.
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Raphael Chosson, Anne-Françoise Gourgues-Lorenzon, V. Vandenberghe, Jean-Christophe Brachet, Jérôme Crépin. Creep flow and fracture behavior of the oxygen-enriched alpha phase in zirconium alloys. Scripta Materialia, Elsevier, 2016, 117, pp.20-23. ⟨10.1016/j.scriptamat.2016.02.021⟩. ⟨hal-01288691⟩

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