Abstract
The thermally-grown alumina formed at 1000, 1100, and 1200°C on magnetron-sputtered, nanocrystalline CoCrAl coatings, with and without yttrium, has been characterized using photostimulated-luminescence spectroscopy. The measurements enable the evolution of initially-formed transient alumina to its stable, α phase to be followed, and in particular, the effect of yttrium on the transformation. Yttrium retards the transformation from gamma to theta alumina and also its subsequent transformation to α alumina. The retardation of the transformation decreases with increasing oxidation temperature until at ∼1200°C the transformation is complete within minutes. The presence of yttrium in the coatings also affects the residual stress in the thermally-grown oxide. For samples oxidized at 1100 and 1200°C the residual stress is ∼0.3 GPa higher in the oxide on the Y-containing coating, whereas the residual stresses are the same after oxidation at 1000°C.
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Peng, X., Clarke, D. & Wang, F. Transient-Alumina Transformations During the Oxidation of Magnetron-Sputtered CoCrAl Nanocrystalline Coatings. Oxidation of Metals 60, 225–240 (2003). https://doi.org/10.1023/A:1026015101783
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DOI: https://doi.org/10.1023/A:1026015101783