Abstract
In the present work attention is paid on the composition, structure and protective properties of alumina layer produced by high temperature oxidation on MA 956 superalloy (Fe-20Cr-4.5Al-0.5Ti-0.5Y2O3 (wt %)). The combination of good mechanical properties of this material and the excellent biocompatibility, the good wear and corrosion behavior of an outer α-alumina layer, limiting the release of ionic species and wear debris from the bulk material into the body-fluid environment, can make this material a candidate alloy for medical applications. Isothermal oxidation at 1100 °C in air of the alloy has led to the formation of a fine-grained, compact and adherent α-alumina scale. Oxide nodules rich in Ti, Y, Cr, and Fe were found on the top of the surface. In vitro electrochemical corrosion experiments showed good protective properties of the oxide scale. Moreover, no spallation of the alumina layer was observed. This feature is significant considering that the alumina layer has to withstand very high compressive stresses resulting from both growth and thermal stresses incorporated during cooling. © 2001 Kluwer Academic Publishers
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García-Alonso, M.C., González-Carrasco, J.L., Pérez, P. et al. A surface modified ODS superalloy by thermal oxidation for potential implant applications. Journal of Materials Science: Materials in Medicine 12, 589–596 (2001). https://doi.org/10.1023/A:1011281425321
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DOI: https://doi.org/10.1023/A:1011281425321