A new method for evaluating the size of plate-like precipitates by small-angle scattering

A methodology is presented for extracting the thickness and length of plate‐like precipitates from streaking that appears in the small‐angle scattering pattern of moderately textured polycrystalline samples. This methodology builds upon existing work on single crystals but is extended to polycrystal...

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Bibliographic Details
Published inJournal of applied crystallography Vol. 45; no. 6; pp. 1208 - 1218
Main Authors De Geuser, Frédéric, Bley, Françoise, Deschamps, Alexis
Format Journal Article
LanguageEnglish
Published 5 Abbey Square, Chester, Cheshire CH1 2HU, England International Union of Crystallography 01.12.2012
Blackwell Publishing Ltd
Subjects
Chemical Sciences
Construction
Curvature
Density
Material chemistry
Methodology
Phases
plate-like precipitates
Polycrystals
Precipitates
Precipitation
Scattering
small-angle scattering
textured polycrystalline samples
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Summary:A methodology is presented for extracting the thickness and length of plate‐like precipitates from streaking that appears in the small‐angle scattering pattern of moderately textured polycrystalline samples. This methodology builds upon existing work on single crystals but is extended to polycrystals through a modeling of the streaking misalignment distribution. It is also shown that it is essential to take into account the Ewald sphere curvature. The protocol is applied to an in situ small‐angle X‐ray scattering study of the transition between θ′ and T1 in an Al–Li–Cu system, where the contributions of both phases are well separated, and the size, volume fraction and number density are monitored.
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ArticleID:JCRAJ5199
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1600-5767
0021-8898
1600-5767
DOI:10.1107/S0021889812039891