Berlin 2008 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 48: Phase Transitions V

MM 48.3: Vortrag

Freitag, 29. Februar 2008, 10:45–11:00, H 0107

Real-time transmission electron microscopy of equilibrium order fluctuations in Cu₃Au — Xavier Sauvage¹, •Harald Reichert¹, Klaus Mecke², Sebastian Kapfer², Fritz Phillipp¹, and Helmut Dosch^1,3 — ¹Max-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.