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Related Experiment Video

Updated: Mar 23, 2026

Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
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Orientation relationship of eutectoid FeAl and FeAl2.

A Scherf1, A Kauffmann1, S Kauffmann-Weiss2

  • 1Institute of Applied Materials (IAM-WK), Karlsruhe Institute of Technology (KIT) , Karlsruhe, Germany.

Journal of Applied Crystallography
|April 6, 2016
PubMed
Summary

This study re-evaluates the orientation relationship between FeAl and FeAl2 phases in Fe-Al alloys, clarifying their crystallographic connection during eutectoid decomposition. Findings provide an atomistic model for the Fe5Al8 phase transformation.

Keywords:
electron backscatter diffractioneutectoid decompositioninterfacesiron aluminides

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Area of Science:

  • Materials Science
  • Crystallography
  • Metallurgy

Background:

  • Fe-Al alloys with 55-65 at.% Al exhibit a lamellar microstructure of B2-ordered FeAl and triclinic FeAl2.
  • This microstructure results from the eutectoid decomposition of the high-temperature Fe5Al8 (epsilon) phase.
  • Previous studies on the FeAl-FeAl2 orientation relationship yielded conflicting results due to differing crystallographic data for FeAl2.

Purpose of the Study:

  • To re-evaluate and clarify the orientation relationship between FeAl and FeAl2 phases in Fe-Al alloys.
  • To reconcile previous conflicting orientation relationship data using updated crystallographic information for FeAl2.
  • To develop an atomistic model for the eutectoid decomposition of the Fe5Al8 phase.

Main Methods:

  • Re-evaluation of crystallographic data for FeAl2 based on recent determinations.
  • Analysis of orientation relationships using orientation imaging microscopy and global texture measurements on as-cast and directionally solidified materials.
  • Trace analyses via focused ion beam cross-sectioning to identify preferential interfaces (habit planes).

Main Results:

  • Both previously reported orientation relationships are reconciled by a 180° rotation about a <112> axis of FeAl or by applying the inversion symmetry of FeAl2.
  • Experimental validation of the orientation relationships was confirmed in various Fe-Al alloy microstructures.
  • A preferential interface (habit plane) was identified, allowing the orientation relationship to be described as (010)FeAl || (114)FeAl2 and [111]FeAl || [1-10]FeAl2.

Conclusions:

  • The study successfully clarifies the orientation relationship between FeAl and FeAl2 phases, resolving discrepancies in prior research.
  • An atomistic model of the Fe5Al8, FeAl, and FeAl2 structure relationship during eutectoid decomposition was derived, considering interfacial strain.
  • No evidence of twinning within FeAl lamellae or alternating orientations was observed.