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Chemical composition of nano-phases studied by anomalous small-angle X-ray scattering (ASAXS)

Communication sans acte
Auteur
MORFIN, I.
144285 Laboratoire Interdisciplinaire de Physique [Saint Martin d’Hères] [LIPhy]
DE GEUSER, F.
32956 Science et Ingénierie des Matériaux et Procédés [SIMaP]
COMMIN, Loreleï
LEGENDRE, F.
MAUGIS, P.
ccDUMONT, Myriam
199957 Institut des Matériaux, de Microélectronique et des Nanosciences de Provence [IM2NP]
BARRALLIER, Laurent
211915 Mechanics surfaces and materials processing [MSMP]
ccJÉGOU, Sébastien

URI
http://hdl.handle.net/10985/10004
Date
2014

Résumé

Anomalous small-angle X-ray scattering (ASAXS) is a technique developed in the 1980s. It offers the opportunity to go further in the investigation of nano-objects by providing chemical information besides characteristic features like size and volume fraction given by classical SAXS. ASAXS is an element-selective technique based on the anomalous variation of the scattering factor near the absorption edge of one chosen element. This technique requires a tunable wavelength of the incident beam that is available on synchrotron radiation sources. In this study, a simple approach is proposed and detailed to extract chemical information from anomalous SAXS data. To illustrate the procedure, two examples are treated by applying this data processing. The first one aims to discriminate between different possible phases in the Y- Ti-O system that may form nano-oxides in oxide-dispersion-strenghtened (ODS) steels, materials for future nuclear plants. The second one deals with the composition of nano- precipitates formed in the diffusion layer of nitrided steels. Such information is of prime importance to evaluate the maximum nitrogen that can be introduced by such a surface treatment and thus the mechanical properties that can be achieved.

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    Article dans une revue avec comité de lecture
    COMMIN, Loreleï; ROTINAT, René; PIERRON, Fabrice; ccDUMONT, Myriam; ccMASSE, Jean-Eric; BARRALLIER, Laurent (Elsevier, 2012)
    Friction stir welding induces a microstructural evolution and residual stresses that will influence the resulting mechanical properties. Friction stir welds produced from magnesium alloy hot rolled plates were studied. ...
  • Texture evolution in Nd:YAG-laser welds of AZ31 magnesium alloy hot rolled sheets and its influence on mechanical properties 
    Article dans une revue avec comité de lecture
    COMMIN, Loreleï; ROTINAT, René; PIERRON, Fabrice; ccDUMONT, Myriam; ccMASSE, Jean-Eric; BARRALLIER, Laurent (Elsevier, 2011)
    AZ31 hot rolled magnesium alloy presents a strong basal texture. Using laser beam welding (LBW) as a joining process induces high temperature gradients leading to major texture changes. EBSD was used to study the texture ...
  • Friction stir welding of AZ31 magnesium alloy rolled sheets: Influence of processing parameters 
    Article dans une revue avec comité de lecture
    COMMIN, Loreleï; ccDUMONT, Myriam; ccMASSE, Jean-Eric; BARRALLIER, Laurent (Elsevier, 2009)
    The temperature evolution during friction stir welding (FSW) and the resulting residual stresses of AZ31 Mg alloy were studied to get a better understanding of the mechanisms involved in this process. The relationship ...
  • Determination of the volume fraction of precipitates in a nitrided Fe- 0.354 wt% C-2.93 wt% Cr model alloy by anomalous small angle X-ray scattering 
    Article dans une revue avec comité de lecture
    ccDUMONT, Myriam; BARRALLIER, Laurent; ccJÉGOU, Sébastien (Elsevier, 2018)
    Anomalous small angle scattering (ASAXS) is a powerful non-destructive technique that can provide char- acteristic features of nanoscale precipitates such as the volume fraction, and chemical composition. In this paper, ...
  • Microstructure Characterization of a Nitrided Fe- 3wt.%Cr-0.3wt.%C Model Alloy by Anomalous Small Angle X-ray Scattering 
    Communication avec acte
    ccDUMONT, Myriam; BARRALLIER, Laurent; ccJÉGOU, Sébastien (2015)
    Nitriding is a thermo-chemical surface treatment of steels providing an improved fatigue and wear resistance. This treatment is based on nitrogen diffusion involving the precipitation of nano-scaled nitrides from the solid ...

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