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

Published online by Cambridge University Press:  02 January 2015

Xiaolin Li ,
Martin Palm ,
Anke Scherf ,
Daniel Janda ,
Martin Heilmaier  and
Frank Stein
Xiaolin Li
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
Martin Palm
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
Anke Scherf
Affiliation:
Karlsruhe Institute of Technology, Karlsruhe, Germany
Daniel Janda
Affiliation:
Karlsruhe Institute of Technology, Karlsruhe, Germany
Martin Heilmaier
Affiliation:
Karlsruhe Institute of Technology, Karlsruhe, Germany
Frank Stein
Affiliation:
Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany
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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 heat-treated 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).

Keywords

microstructureAlalloy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy04-09
Copyright
Copyright © Materials Research Society 2014 

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References

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