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Self-Induced Stress and Matter Transport Interactions during Metal Oxidation

Zirconium and nickel high-temperature oxidation is approached by the mechanochemical aspect, in order to evaluate the influence of stress-free strains on the oxidation rate by a theoretical way. The formulation of the matter transport uses a coupling between both composition and stress fields to associate the mechanical strains with the reactional process. The reactivity is treated at the mesoscopic level. The epitaxial strains are taken into account in the mechanical behaviour of the oxide scale. The simulated oxidation kinetics are qualitatively in accordance with the experimental ones. Our study confirms the significant role of stresses localized near the metal/oxide interface on the oxidation kinetics. Our conclusions consolidate the necessity to associate mechanics and diffusion in a realistic modelling of the metal oxidation.