Abstract
The oxidation behavior in air of two ODSsuperalloys, the chromia-forming PM 1000 and thealumina-forming PM 2000, was investigated attemperatures between 900 and 1300°C. For both alloysgrowth rates of the oxide scales obey a subparabolic timedependence and an Arrhenius-type temperature dependenceof the rate constants is observed. Diffusion of yttriumto the surface of the oxide scales leads to almost complete depletion of this element within theoxide scales of both alloys. Scale growth then takesplace by simultaneous inward diffusion of oxygen andoutward diffusion of cations. At this stage of the oxidation process, the scale-growth mechanismis similar for both ODS alloys, at least in aqualitative way, to conventional (non-ODS) alloys of thesame base composition.
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Weinbruch, S., Anastassiadis, A., Ortner, H.M. et al. On the Mechanism of High-Temperature Oxidation of ODS Superalloys: Significance of Yttrium Depletion Within the Oxide Scales. Oxidation of Metals 51, 111–128 (1999). https://doi.org/10.1023/A:1018806319821
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DOI: https://doi.org/10.1023/A:1018806319821