Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 17: Poster Session

MM 17.15: Poster

Montag, 26. März 2012, 17:00–19:00, Poster B

Order-disorder transformation in copper-gold alloys revisited by in situ X-ray diffraction — •Max Metelmann, Martin Peterlechner, Harald Rösner, and Gerhard Wilde — Westfälische Wilhelms-Universität Münster, Institute of Materials Physics, Wilhelm-Klemmstr. 10, 48149 Münster, Germany

CuAu alloys with an equi-atomic composition exhibit a well known order-disorder phase transformation in the solid state. Detailed analyses of this order-disorder transition were performed using in situ heating X-ray diffraction.This method enables temperature and time-resolved studies of the long range order parameter, which can be calculated from diffraction spectra. By means of in-situ X-ray diffraction, the temperature dependence of the peak intensity has been investigated, i.e. the Debye-Waller factor has been determined. In addition, the decrease of the peak intensity with increasing temperature and increasing angle of incidence is modeled. The comparison between experiments and calculations indicates that the experimental results are imprecisely described. The results are discussed with respect of corrections to the theoretical description of the Debye-Waller factor.