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MM: Fachverband Metall- und Materialphysik

MM 61: Liquid & Amorphous Metals I

MM 61.4: Vortrag

Donnerstag, 14. März 2013, 16:30–16:45, H26

Crystallisation and glass transition of a AuSi based metallic glass investigated by chip based ultra fast scanning calorimetry — •Joachim Bokeloh, Jonas Bünz, and Gerhard Wilde — Institut für Materialphysik, WWU Münster

The glass transition as well as the crystallization of metallic glasses have been extensively studied in the past. These investigations are limited by two experimental issues. For one, the complex relationship between intrinsic properties of the material and its time-temperature history renders the state of cast samples somewhat ambiguous. Secondly, conventional laboratory equipment is incapable of exploring the broad dynamic range that is of interest in the case of metallic glasses.

We present here measurements of a AuSi based metallic glass by chip-based ultra fast scanning calorimetry (50K/s - 10 000 Ks). The high heating and cooling rates allow for a highly controlled and repeatable in-situ vitrification of a glassy sample, investigation of the glass transition during heating as well as cooling at various rates and an in-depth analysis of the crystallization behaviour when cooled down from the melt, as compared to when heated up from the glassy state.