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MM: Fachverband Metall- und Materialphysik

MM 11: Liquid and Amorphous Metals III

MM 11.4: Talk

Monday, March 14, 2011, 16:30–16:45, IFW D

Relaxation kinetics of a AuCuAgSi bulk metallic glass — •Jonas Bünz and Gerhard Wilde — Institut für Materialphysik, WWU Münster

Au-based bulk metallic glasses that were recently discovered belong to the metallic glasses that provide the highest kinetic stability against devitrification. Additionally, and in contrast to earlier types of metallic glasses with high stability, the glass transition occurs at rather low temperatures around 100°C. This allows the determination of the temperature dependence of the relaxation time directly with microcalorimetry for a Au50Cu25.5Ag7.5Si17 bulk metallic glass with very high accuracy. The availability of both relaxation data for enthalpy and volume and thermodynamic data for this specific system allows comparing different models for the structural relaxation on the basis of experimental data.