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Communication Dans Un Congrès Année : 2014

Contribution of in situ acoustic emission analysis coupled with thermogravimetry to study zirconium alloy oxidation

Résumé

Zirconium alloy (zircaloy-4) corrosion behavior under oxidizing atmosphere at high temperature was studied using thermogravimetric experiment associated with acoustic emission analysis. Under a mixture of oxygen and air in helium, an acceleration of the corrosion is observed due to the detrimental effect of nitrogen which produces zirconium nitride. The kinetic rate increases significantly after a kinetic transition (breakaway). This acceleration is accompanied by an acoustic emission activity. Most of the acoustic emission bursts were recorded after the kinetic transition or during the cooling of the sample. Acoustic emission signals analysis allows us to distinguish different populations of cracks in the ZrO2 layer. These cracks have also been observed by SEM on post mortem cross section of oxidized samples and by in-situ microscopy observations on the top surface of the sample during oxidation.
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Dates et versions

hal-01098149 , version 1 (23-02-2015)

Identifiants

  • HAL Id : hal-01098149 , version 1

Citer

Omar Al Haj, Véronique Peres, Eric Serris, François Grosjean, Jean Kittel, et al.. Contribution of in situ acoustic emission analysis coupled with thermogravimetry to study zirconium alloy oxidation. Fontevraud 8 - Contribution of Materials Investigations and Operating Experience to LWRs’ Safety, Performance and Reliability, Sep 2014, Avignon, France. ⟨hal-01098149⟩
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