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    Ordering and site occupancy of D03 ordered Fe3Al-5 at%Cr evaluated by means of atom probe tomography

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    Type
    Article
    Authors
    Rademacher, Thomas W.
    Al-Kassab, Tala'at
    Deges, Johannes
    Kirchheim, Reiner
    KAUST Department
    Material Science and Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2011-05
    Permanent link to this record
    http://hdl.handle.net/10754/561770
    
    Metadata
    Show full item record
    Abstract
    Addition of ternary elements to the D03 ordered Fe3Al intermetallic phase is a general approach to optimise its mechanical properties. To understand the physical influences of such additions the determination of the probability of site occupancies of these additions on the lattice site and ordering parameters is of high interest. Some common experimental techniques such as X-ray diffraction or Atom Location by Channelling Enhanced Microanalysis (ALCHEMI) are usually applied to explore this interplay. Unfortunately, certain published results are partly inconsistent, imprecise or even contradictory. In this study, these aspects are evaluated systematically by atom probe tomography (APT) and a special data analysis method. Additionally, to account for possible field evaporation effects that can falsify the estimation of site occupancy and induce misinterpretations, APT evaporation sequences were also simulated. As a result, chromium occupies most frequently the next nearest neighbour sites of Al atoms and local ordering parameters could be achieved. © 2010 Elsevier B.V.
    Citation
    Rademacher, T., Al-Kassab, T., Deges, J., & Kirchheim, R. (2011). Ordering and site occupancy of D03 ordered Fe3Al–5at%Cr evaluated by means of atom probe tomography. Ultramicroscopy, 111(6), 719–724. doi:10.1016/j.ultramic.2010.12.009
    Sponsors
    This project was friendly supported by the DFG - Deutsche Forschungs Gemeinschaft - under contract number DFG-Az.: AL 592/3-1.
    Publisher
    Elsevier BV
    Journal
    Ultramicroscopy
    DOI
    10.1016/j.ultramic.2010.12.009
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.ultramic.2010.12.009
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Material Science and Engineering Program

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