Comptes Rendus
no. 3
Use of large scale facilities for research in metallurgy
Precipitate characterisation in metallic systems by small-angle X-ray or neutron scattering
[Caractérisation des précipités dans les systèmes métalliques utilisant la diffusion aux petits angles des rayons X ou des neutrons]
Frédéric De Geuser1  ; Alexis Deschamps1
1 SIMaP, Grenoble INP – CNRS – UJF, BP. 75, 38402 Saint Martin dʼHères cedex, France
Comptes Rendus. Physique, Volume 13 (2012) no. 3, pp. 246-256.

La technique de diffusion aux petits angles permet lʼobtention dʼinformations précises et quantitatives sur les microstructures de précipitation à lʼéchelle nanométrique. Elle peut être utilisée avec des rayons X (DXPA ou SAXS) ou avec des neutrons (DNPA ou SANS). Cet article présente des méthodes simples pour extraire des informations sur les tailles et fractions volumiques des précipités à partir des spectres de diffusion. Différentes méthodes sont indiquées, ainsi que leur signification et différences. Des exemples dʼapplications sont donnés pour la caractérisation de microstructures complexes dans les cas suivants : mesures in-situ de cinétiques de précipitation dans Fe–Cu et Fe–Nb–C, précipitation non stoechiométrique évaluée par diffusion anormale des rayons X (ASAXS), et cartographie de précipitation dans les sections transverses de soudures.

Small-angle scattering enables the extraction of precise, quantitative information about nano-scale precipitate microstructures. It can be used with X-rays (SAXS) or neutrons (SANS). This paper presents simple methods for extracting information on the precipitate size and volume fraction from SAS spectra. The various possibilities for obtaining precipitate size are reviewed, and the meaning of their differences is discussed. Examples of applications for complex precipitate microstructure measurements are given in the following areas: kinetic in-situ measurements in Fe–Cu and Fe–Nb–C alloys, non-stoichiometric precipitation in an Al–Zn–Mg–Cu alloy studied by anomalous SAXS (ASAXS), and precipitation mapping in weld cross-sections.

Publié le :
DOI : 10.1016/j.crhy.2011.12.008
Keywords: Small-angle scattering, SAXS, SANS, Precipitation
Mot clés : Diffusion aux petits angles, DXPA, DNPA, Précipitation
Frédéric De Geuser 1 ; Alexis Deschamps 1

1 SIMaP, Grenoble INP – CNRS – UJF, BP. 75, 38402 Saint Martin dʼHères cedex, France 
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Frédéric De Geuser; Alexis Deschamps. Precipitate characterisation in metallic systems by small-angle X-ray or neutron scattering. Comptes Rendus. Physique, Volume 13 (2012) no. 3, pp. 246-256. doi : 10.1016/j.crhy.2011.12.008. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2011.12.008/

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