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MM: Fachverband Metall- und Materialphysik

MM 4: Liquid and Amorphous Metals I: Fragility and Dynamics of Metallic Glasses

MM 4.5: Vortrag

Montag, 16. März 2015, 11:15–11:30, H 0107

Fictive temperature and glass transition temperature of a metallic glass investigated by fast scanning calorimetry — •Christian Simon, Joachim Bokeloh, Jonas Bünz, and Gerhard Wilde — Institut für Materialphysik, WWU Münster, Wilhelm-Klemm-Str. 10, 48155 Münster

The use of fast scanning calorimeters allows a new access to thermal analysis experiments on metallic glasses. The glass transition and the crystallization were often in the focus of different studies. These studies are often limited by the heating and cooling rates of the conventional devices. The fast scanning calorimeters allow the investigation of glass transition and crystallization at high rates. The fictive temperature of glass is the temperature at which the structure of an equilibrium liquid is frozen-in. The determination of the fictive temperature is usually done by a heat capacity matching method. The strong requirement of a defined thermal history is often a difficult task for the determination of fictive temperature in the case of metallic glasses. The fast scanning calorimeter allows the in-situ production of metallic glasses and thus leads to a reproducable thermal history of the sample for every single measurement. We present data from a AuSi based metallic glass investigated by a fast scanning calorimter (50 K/s - 20 000 K/s). The obtained data cover a wide kinetic regime and are discussed with respect of deviations from Arrhenius behavior at higher heating rates.