Rojas, T. C.Domínguez-Meister, S.Brizuela, M.Sánchez-López, J. C.2024-07-242024-07-242018-11-25Rojas , T C , Domínguez-Meister , S , Brizuela , M & Sánchez-López , J C 2018 , ' High-temperature oxidation of CrAlYN coatings : Implications of the presence of Y and type of steel ' , Surface and Coatings Technology , vol. 354 , pp. 203-213 . https://doi.org/10.1016/j.surfcoat.2018.09.0200257-8972https://hdl.handle.net/11556/4070Publisher Copyright: © 2018 Elsevier B.V.Nanolayered CrAlN and CrAlYN/CrAlN (average contents of Al ≈ 25 at.% and Y ≈ 1.6 at. %) coatings are deposited on M2 and 316 steel substrates and heated to 1000 °C in air for 2 h to study their oxidation mechanism, the thermal stability and the reactive element (RE) effect of yttrium. CrAlN on M2 develops a Cr2O3/Al2O3 passivation layer that preserves in high degree the fcc-CrAlN structure however iron ions leave the substrate and travel to the surface along the column boundaries. The CrAlYN/CrAlN coatings deposited on steels are not stable at 1000 °C, and the initial fcc-CrAlN phase is partially transformed to hcp-Al(O)N and Cr-Fe phases (M2) and Cr2N and Al2O3 (316). The addition of Y changes the predominant scale growth direction. Inward oxygen diffusion becomes dominant but a reduction of the oxide scale thickness as compared to CrAlN is not observed. The advanced microstructural analysis made by transmission electron microscopy combined with electron energy-loss spectroscopy determined that yttrium migrates mainly to the oxide scale (forming mixed oxides with substrate elements - V and Mo, either as dispersed particles or segregated at the grain boundaries) in M2, and to the oxide interface and column boundaries (forming Al-Y oxides and YN, respectively) in 316 steel. The benefits of addition of Y in improving the oxidation resistance are discussed comparatively with literature data. The RE effect of yttrium is thus observed to be dependent on the substrate, film architecture and composition.11enginfo:eu-repo/semantics/openAccessjournal article10.1016/j.surfcoat.2018.09.020High temperature corrosionOxidationRare earth elementsSputtered filmsSteelSTEMGeneral ChemistryCondensed Matter PhysicsSurfaces and InterfacesSurfaces, Coatings and FilmsMaterials Chemistryhttp://www.scopus.com/inward/record.url?scp=85053400563&partnerID=8YFLogxK