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Effect of Microstructure on the Internal Oxidation of Two-Phase Fe–Y Alloys

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Abstract

This work demonstrated the role of microstructure on the internal oxidation rate of two-phase alloys. Fe–Y alloys with Y contents between 1.5 and 15 wt% were employed as a model system. Alloys were prepared by arc-melting and the starting structures were as-solidified mixtures of Fe + Fe17Y2 intermetallic. An alloy with 1.5 wt% Y was cold-rolled to alter the intermetallic morphology. Oxidation was conducted in an Fe–FeO Rhines pack at 600, 700, and 800 °C up to 72 h. Pre- and post-oxidation microstructures were characterized with electron microscopy. Consistent with other studies, only the Fe17Y2 phase oxidized. Transmission electron microscopy showed the Fe17Y2 transformed into nanometer-scale oxides. Oxidation rates were always greater than those predicted by Wagner theory. Parabolic kinetics were obeyed until approximately 10 h. During this time the parabolic rate constants decreased with wt% Y. The effect of alloy microstructure on oxidation kinetics was attributed to connectivity of the Fe17Y2 phase.

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Acknowledgments

The authors acknowledge that funding for this work has been provided by the Wilton E. Scott Institute for Energy Innovation.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Carnegie Mellon University, 3325 Wean Hall, 5000 Forbes Avenue, Pittsburgh, PA, 15213, USA

    Stephen J. Kachur & Bryan A. Webler

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  1. Stephen J. Kachur
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  2. Bryan A. Webler
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Correspondence to Stephen J. Kachur.

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Kachur, S.J., Webler, B.A. Effect of Microstructure on the Internal Oxidation of Two-Phase Fe–Y Alloys. Oxid Met 85, 343–355 (2016). https://doi.org/10.1007/s11085-015-9598-4

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  • DOI: https://doi.org/10.1007/s11085-015-9598-4

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