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MM: Metall- und Materialphysik

MM 42: Diffusion II

MM 42.1: Talk

Friday, March 31, 2006, 11:00–11:15, IFW B

Diffusion-induced recrystallization in Au/Cu thin films — •Britta Kruse, Dietmar Baither, and Guido Schmitz — Westfälische Wilhelms-Universität Münster, Institut für Materialphysik, Wilhelm-Klemm-Str.10, 48149 Münster

Diffusion-induced recrystallization (DIR) was investigated in the Au-Cu system. Double layers of Cu and various AuCu alloys were deposited in (111) thin film texture on glass substrates. The as-prepared composition of the alloys varied from pure Au to 87at.% Cu in six steps, in order to control the lattice mismatch between the two diffusing materials. Heat treatments were performed at 435^∘C, which is well above the highest ordering temperature, so that the formation of intermetallic compounds is excluded. Nevertheless, XRD demonstrates intermediate intensity maxima after the heat treatments. Comparison with simulated XRD spectra and TEM demonstrate that these are related to newly formed grains of distinct compositions inside the diffusion zone. The sequence of the intermediate grain compositions depends characteristically on the initial mismatch. This behaviour may be understood by taking into account elastic stress and its relaxation.