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Atom probe tomography investigation of heterogeneous short-range ordering in the 'komplex' phase state (K-state) of Fe-18Al (at.%)
journal contribution
posted on 2015-04-07, 00:00 authored by Ross MarceauRoss Marceau, A V Ceguerra, A J Breen, M Palm, F Stein, S P Ringer, D RaabeWe 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.
History
Journal
IntermetallicsVolume
64Pagination
23 - 31Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
0966-9795Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2015, ElsevierUsage metrics
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No categories selectedKeywords
A. intermetallics (aluminides, silicides)B. order\/disorder transformationD. site occupancyF. atom probeF. tomographyScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringChemistryMaterials Scienceintermetallics (aluminides, silicides)order\/disorder transformationsite occupancyatom probetomographyIRON-ALUMINUM-ALLOYSFE-AL ALLOYSQUENCHED-IN VACANCIESX-RAYPOSITRON-ANNIHILATIONDEFORMATION-BEHAVIORSOLID-SOLUTIONSSINGLE-CRYSTALMAGNETIC-PROPERTIESDIFFUSE-SCATTERING
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