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Abstract: The aim of the present work is to introduce a thermodynamic model to describethe growth of an oxide layer on a metallic substrate. More precisely, thispaper offers a study of oxygen dissolution into a solid, and its consequenceson the apparition of mechanical stresses. They strongly influence the oxidationprocesses and may be, in some materials, responsible for cracking. To realizethis study, mechanical considerations are introduced into the classicaldiffusion laws. Simulations were made for the particular case of uraniumdioxide, which undergoes the chemical fragmentation. According to oursimulations, the hypothesis of a compression stress field into the oxidised UO2compound near the internal interface is consistent with the interpretation ofthe mechanisms of oxidation observed experimentally.



Author: Nicolas Creton ICB, Virgil Optasanu ICB, Tony Montesin ICB, Sébastien Garruchet ICB, Lionel Desgranges LLCC

Source: https://arxiv.org/







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