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Physical Review B (Condensed Matter and Materials Physics -1(II)) Phys. Rev. B 68, 180101(R) (2003) (4 pages)

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Long-term correlations distinguish coarsening mechanisms in alloys

Lorenz-M. Stadler,¹ Bogdan Sepiol,¹ Richard Weinkamer,² Markus Hartmann,² Peter Fratzl,² Jan W. Kantelhardt,³ Federico Zontone,⁴ Gerhard Grübel,⁴ 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/abstract/PRB/v68/e180101
doi:10.1103/PhysRevB.68.180101
PACS: 61.10.-i, 64.75.+g, 81.40.-z        Additional Information

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Citing Articles

1. Revealing antiphase-domain dynamics in alloys by combining advanced statistical techniques with x-ray photon correlation spectroscopy
   Lorenz-M. Stadler et al., Phys. Rev. B 69, 224301 (2004)