Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster Session

MM 26.12: Poster

Dienstag, 23. März 2010, 14:45–16:30, Poster C

Relaxation of Volume and Enthalpy of Bulk Metallic Glasses — •Jonas Bünz, Joachim Bokeloh, and Gerhard Wilde — Institut für Materialphysik, WWU Münster

Although the relaxation of glasses is a phenomenon that is known for centuries and that is actually at the very foundations of the unique applicability of glasses in general - the controlled modification of properties without changes of the chemical composition - the physics behind the relaxation and aging processes that occur in glasses after initial quenching are far from being understood. In fact, it is basically still unclear whether the relaxation of the excess free volume and the relaxation of the excess enthalpy are identical processes that are governed by only one underlying mechanism. Measuring the kinetics of these properties with different methods like differential scanning calorimetry, microcalorimetry, dilatometry and the buoyancy method allow covering a broad range of temperatures and materials and offer the possibility to experimentally access the isothermal relaxation characteristics of the volume and the enthalpy directly on time scales that range from several hours to weeks. The results were evaluated in the framework of the free volume theory.