Criterion for instability of oxide film growth with respect to formation of cracks |
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| Affiliation: | 1. Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Beijing 100191, China;2. Computational Alloy Design Group, Madrid Institute for Advanced Studies of Materials, Madrid 28906, Spain;3. School of Materials Science and Engineering, University of New South Wales, Sydney, NSW 2052, Australia |
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| Abstract: | If the rate of oxidation along metal grain boundaries is higher than that in the perfect metal, the oxide growth in these regions is accompanied by deformation of the oxide film and creation of strongly non-uniform stresses. The latter is shown to result in formation of cracks if h >l (γ/lE)1/5, where h is the oxide-film thickness, l the metal-grain size, γ the oxide surface energy, and E the oxide Young modulus. The criterion derived is applied to interpret the transition from the parabolic to linear regime of oxidation of Zr alloys. |
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