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Berlin 2008 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 48: Phase Transitions V

MM 48.3: Talk

Friday, February 29, 2008, 10:45–11:00, H 0107

Real-time transmission electron microscopy of equilibrium order fluctuations in Cu3AuXavier Sauvage1, •Harald Reichert1, Klaus Mecke2, Sebastian Kapfer2, Fritz Phillipp1, and Helmut Dosch1,31Max-Planck-Institut für Metallforschung, Heisenbergstrasse 3, 70569 Stuttgart, Germany — 2Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany — 3Universität Stuttgart, Institut für Theoretische und Angewandte Physik, Pfaffenwaldring 57, D-70550 Stuttgart, Germany

Using fluctuation microscopy we have monitored local order parameter fluctuations in the binary alloy Cu3Au in real time with atomic resolution. Close to the phase transformation from the disordered A1 phase to the ordered L12 structure we found well defined ordered domains with a size of approximately 2nm which are fluctuating on a time scale of 1 second. The morphology of the fluctuations (size and shape) was quantified by Minkowski functionals. The analysis of the Minkowski functionals shows, that although the phase transformation is of first order, the transformation appears to be continuous on a local scale.

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