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Resampling technique applied to statistics of microsegregation characterization

Lacaze, Jacques and Eiken, Janin and Hazotte, Alain Resampling technique applied to statistics of microsegregation characterization. (2012) IOP Conference Series: Materials Science and Engineering, 33 (Conf. 1). 1-8. ISSN 1757-899X

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Official URL: http://dx.doi.org/10.1088/1757-899X/33/1/012062


Characterization of chemical heterogeneities at the dendrite scale is of practical importance for understanding phase transformation either during solidification or during subsequent solid-state treatment. Spot analysis with electron probe is definitely well-suited to investigate such heterogeneities at the micron scale that is relevant for most solidified products. However, very few has been done about the statistics of experimental solute distributions gained from such analyses when they are now more and more used for validating simulation data. There are two main sources generating discrepancies between estimated and actual solute distributions in an alloy: i) data sampling with a limited number of measurements to keep analysis within a reasonable time length; and ii) uncertainty linked to the measurement process, namely the physical noise that accompanies X-ray emission. Focusing on the first of these sources, a few 2-D composition images have been generated by phase field modelling of a Mg-Al alloy. These images were then used to obtain "true" solute distributions to which to compare coarse grid analyses as generally performed with a microanalyser. Resampling, i.e. generating several distributions by grid analyses with limited number of picked-up values, was then used to get statistics of estimates of solute distribution. The discussion of the present results deals first with estimating the average solute content and then focuses on the distribution in the primary phase.

Item Type:Article
Additional Information:Thanks to IOP Publishing. The definitive version is available at http://iopscience.iop.org/1757-899X/33/1/012062/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > ACCESS (GERMANY)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Nationale d’Ingénieurs de Metz - ENIM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université Paul-Verlaine - Metz (FRANCE)
Laboratory name:
Deposited On:26 Aug 2013 12:39

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