Atom probe tomography investigation of heterogeneous short-range ordering in the 'komplex' phase state (K-state) of Fe-18Al (at.%)

Marceau, R. K. W., Ceguerra, A. V., Breen, A. J., Palm, M., Stein, F., Ringer, S. P. and Raabe, D. 2015, Atom probe tomography investigation of heterogeneous short-range ordering in the 'komplex' phase state (K-state) of Fe-18Al (at.%), Intermetallics, vol. 64, pp. 23-31, doi: 10.1016/j.intermet.2015.04.005.

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Title Atom probe tomography investigation of heterogeneous short-range ordering in the 'komplex' phase state (K-state) of Fe-18Al (at.%)
Author(s) Marceau, R. K. W.ORCID iD for Marceau, R. K. W.
Ceguerra, A. V.
Breen, A. J.
Palm, M.
Stein, F.
Ringer, S. P.
Raabe, D.
Journal name Intermetallics
Volume number 64
Start page 23
End page 31
Total pages 9
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015-04-07
ISSN 0966-9795
Keyword(s) A. intermetallics (aluminides, silicides)
B. order/disorder transformation
D. site occupancy
F. atom probe
F. tomography
Science & Technology
Physical Sciences
Chemistry, Physical
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
intermetallics (aluminides, silicides)
order/disorder transformation
site occupancy
atom probe
Summary We study an Fe-18Al (at.%) alloy after various thermal treatments at different times (24-336 h) and temperatures (250-1100 °C) to determine the nature of the so-called 'komplex' phase state (or "K-state"), which is common to other alloy systems having compositions at the boundaries of known order-disorder transitions and is characterised by heterogeneous short-range-ordering (SRO). This has been done by direct observation using atom probe tomography (APT), which reveals that nano-sized, ordered regions/particles do not exist. Also, by employing shell-based analysis of the three-dimensional atomic positions, we have determined chemically sensitive, generalised multicomponent short-range order (GM-SRO) parameters, which are compared with published pairwise SRO parameters derived from bulk, volume-averaged measurement techniques (e.g. X-ray and neutron scattering, Mössbauer spectroscopy) and combined ab-initio and Monte Carlo simulations. This analysis procedure has general relevance for other alloy systems where quantitative chemical-structure evaluation of local atomic environments is required to understand ordering and partial ordering phenomena that affect physical and mechanical properties.
Language eng
DOI 10.1016/j.intermet.2015.04.005
Field of Research 091207 Metals and Alloy Materials
020401 Condensed Matter Characterisation Technique Development
Socio Economic Objective 970102 Expanding Knowledge in the Physical Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
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Document type: Journal Article
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