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

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Marceau,  Ross K. W.
Deakin University, Institute for Frontier Materials, Geelong Waurn Ponds CampusVIC, Australia;
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Palm,  Martin
Development and Characterisation of New Materials, Materials Technology, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Stein,  Frank
Development and Characterisation of New Materials, Materials Technology, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Raabe,  Dierk
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

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


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-12FB-5
Abstract
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.