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Microstructure and Phase Transformation Temperatures of Two-Phase FeAl (B2) + FeAl2 Alloys

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Abstract

Fe-Al alloys with about 55 to 65 at.% Al undergo a eutectoid transformation at 1095 °C: Fe5Al8 (ε) ↔ FeAl + FeAl2. Hence, as-cast Fe-Al alloys in this composition range show a very fine-scaled lamellar microstructure (average lamellar spacing below 500 nm) consisting of the two phases FeAl and FeAl2. The microstructure looks similar to the α2 + γ lamellar microstructure of Ti-Al-based alloys, which is known for having well-balanced properties in terms of creep, ductility and strength. However, there is limited knowledge about the properties of Fe-Al-based alloys in this composition range. In this study, a series of as-cast as well as heattreated Fe-Al alloys with compositions between 57 and 63 at.% Al were investigated. The microstructures and crystal structures were analysed by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. The composition dependence of all transition temperatures was obtained by differential thermal analysis (DTA).

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Acknowledgements

The authors would like to thank Mr. M. Kulse for alloy production, Mr. G. Bialkowski for sample cutting, Mr. B. Breitbach for XRD measurements, and Mr. D. Kurz for wet chemical analyses. Financial support by the German Research Foundation (DFG) within the project “Feinlamellare Fe-Al in situ Kompositwerkstoffe” is gratefully acknowledged.

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Authors and Affiliations

  1. Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany

    Xiaolin Li, Martin Palm & Frank Stein

  2. Karlsruhe Institute of Technology, Karlsruhe, Germany

    Anke Scherf, Daniel Janda & Martin Heilmaier

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  1. Xiaolin Li
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  2. Martin Palm
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  3. Anke Scherf
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  4. Daniel Janda
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  5. Martin Heilmaier
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  6. Frank Stein
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Li, X., Palm, M., Scherf, A. et al. Microstructure and Phase Transformation Temperatures of Two-Phase FeAl (B2) + FeAl2 Alloys. MRS Online Proceedings Library 1760, 55–60 (2014). https://doi.org/10.1557/opl.2014.965

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  • DOI: https://doi.org/10.1557/opl.2014.965

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