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Phys. Rev. B 68, 180101(R) (2003) [4 pages]

Long-term correlations distinguish coarsening mechanisms in alloys

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Lorenz-M. Stadler1,*, Bogdan Sepiol1, Richard Weinkamer2, Markus Hartmann2, Peter Fratzl2, Jan W. Kantelhardt3, Federico Zontone4, Gerhard Grübel4, and Gero Vogl1
1Institut für Materialphysik, Universität Wien, Strudlhofgasse 4, A-1090 Wien, Austria
2Max-Planck-Institute of Colloids and Interfaces, Department of Biomaterials, D-14424 Potsdam, Germany
3Institut für Theoretische Physik III, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
4European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex, France

Received 11 July 2003; published 3 November 2003

We determine long-term correlations in the time series of fluctuating x-ray speckle intensities. A fluctuation analysis of small angle x-ray scattering data of the two phase-separating alloys Al-6 at. %Ag and Al-9 at. %Zn at late stages of phase separation reveals long-term correlations that are dramatically different for the two systems. From a comparison with recent Monte Carlo simulations we conclude that two different coarsening mechanisms are predominant in the two alloys—coarsening either by diffusion of single atoms or by movement of whole precipitates.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.180101
DOI:
10.1103/PhysRevB.68.180101
PACS:
61.10.-i, 64.75.+g, 81.40.-z

*Email address: lstadler@ap.univie.ac.at

 
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