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  Defining clusters in APT reconstructions of ODS steels

Williams, C. A., Haley, D., Marquis, E. A., Smith, G. D. W., & Moody, M. P. (2013). Defining clusters in APT reconstructions of ODS steels. Ultramicroscopy, 132, 271-278. doi:10.1016/j.ultramic.2012.12.011.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-E2F3-D Version Permalink: http://hdl.handle.net/21.11116/0000-0001-E2F4-C
Genre: Journal Article

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 Creators:
Williams, Ceri A.1, Author              
Haley, Daniel2, 3, Author              
Marquis, Emmanuelle A.4, Author              
Smith, George Davey. W.5, Author              
Moody, Michael P.6, Author              
Affiliations:
1Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK, persistent22              
2Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              
3University of Oxford, Department of Materials, Parks RoadOxford, UK, ou_persistent22              
4Department of Materials Science and Engineering, University of Michigan, 2300 Hayward Street, Ann Arbor, MI 48109-2136, USA, persistent22              
5Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH UK, persistent22              
6Department of Materials, University of Oxford, Parks Road, Oxford OX13PH, UK, ou_persistent22              

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Free keywords: Atom probe; Atom-probe tomography; Cluster parameters; Clustering; Consolidated materials; Mechanically alloyed powder; ODS; Separation methods, Iron alloys; Mechanical alloying; Titanium oxides; Tungsten, Nanoclusters, alloy; chromium; iron; oxide; oxide dispersion strengthened steel; steel; titanium; tungsten; unclassified drug; yttrium, article; atom probe tomography; chemical composition; cluster analysis; dispersion; quantitative analysis; reliability; separation technique; tomography
 Abstract: Oxide nanoclusters in a consolidated Fe-14Cr-2W-0.3Ti-0.3Y2O3 ODS steel and in the alloy powder after mechanical alloying (but before consolidation) are investigated by atom probe tomography (APT). The maximum separation method is a standard method to define and characterise clusters from within APT data, but this work shows that the extent of clustering between the two materials is sufficiently different that the nanoclusters in the mechanically alloyed powder and in the consolidated material cannot be compared directly using the same cluster selection parameters. As the cluster selection parameters influence the size and composition of the clusters significantly, a procedure to optimise the input parameters for the maximum separation method is proposed by sweeping the dmax and Nmin parameter space. By applying this method of cluster parameter selection combined with a 'matrix correction' to account for trajectory aberrations, differences in the oxide nanoclusters can then be reliably quantified. © 2012 Elsevier B.V.

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Language(s): eng - English
 Dates: 2013-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1016/j.ultramic.2012.12.011
BibTex Citekey: Williams2013271
 Degree: -

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Title: Ultramicroscopy
  Abbreviation : Ultramicroscopy
Source Genre: Journal
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Publ. Info: Amsterdam : North-Holland
Pages: - Volume / Issue: 132 Sequence Number: - Start / End Page: 271 - 278 Identifier: ISSN: 0304-3991
CoNE: /journals/resource/954925512451