Journal
JOURNAL OF APPLIED CRYSTALLOGRAPHY
Volume 50, Issue -, Pages 1725-1734Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600576717014443
Keywords
small-angle scattering; solute; clusters; compositional fluctuations; Al-Cu alloys
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Funding
- CNRS-CEA 'METSA' French network [FR CNRS 3507]
- Constellium C-Tec
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A new methodology for the characterization of solute clusters leading to compositional fluctuations is presented and discussed. The methodology makes use of contrast variation arising from a combination of small-angle scattering using neutrons and X-rays, and adapts a model for solute correlation to extract the chemistry and length scale of clustered states after quench and after natural ageing. In three subsets of the Al-Cu system, Cu-rich clusters are reported for all cases. The presence of Mg strongly enhances Cu clustering in the naturally aged state and results in more than double the number of clusters in the complex Al-Cu-Li-Mg system. The results are compared with those obtained using atom probe tomography.
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