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Surface analysis of a heat-treated, Al-containing, iron-based superalloy

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Abstract

The surface composition of MA 956 superalloy both as-received and after four exposure times at 1100 °C has been investigated by energy dispersive x-ray spectrometry (EDX) and x-ray photoelectron spectroscopy (XPS). The passive layer of the as-received sample is mainly formed by Cr- and Fe-oxides. Heat treatment leads to the formation of an alumina layer on which small nodules grow. XPS spectra evidence the presence of titanium and yttrium oxides at the surface of the heat-treated samples, suggesting Y and Ti outward diffusion through the alumina layer. Iron and chromium oxides at the topmost surface layers are observed only for short heat-treatment times.

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Authors and Affiliations

  1. Departamento de Corrosión y Protección, Centro Nacional de Investigaciones Metalúrgicas, C.S.I.C., Avda. Gregorio del Amo 8, 28040, Madrid, Spain

    M. F. López, A. Gutiéerrez, M. C. García-Alonso & M. L. Escudero

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  1. M. F. López
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  2. A. Gutiéerrez
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  3. M. C. García-Alonso
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  4. M. L. Escudero
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López, M.F., Gutiéerrez, A., García-Alonso, M.C. et al. Surface analysis of a heat-treated, Al-containing, iron-based superalloy. Journal of Materials Research 13, 3411–3416 (1998). https://doi.org/10.1557/JMR.1998.0464

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  • DOI: https://doi.org/10.1557/JMR.1998.0464

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