|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIV
||Entropy Contributions in Strong and Fragile Metallic Glasses
||Hillary Smith, Andrew Hoff, Chen Li, Tabitha Swan-Wood, Fred Yang, Dennis Kim, Marios Demetriou, Brent Fultz
|On-Site Speaker (Planned)
The contribution of vibrational entropy to the excess entropy of the liquid over the crystal at the glass transition has been measured for Cu<SUB>50</SUB>Zr<SUB>50</SUB> and Cu<SUB>46</SUB>Zr<SUB>46</SUB>Al<SUB>8</SUB>. Cu<SUB>50</SUB>Zr<SUB>50</SUB> is among the most fragile metallic glass formers, while the addition of 8% Al results in the strong glass former Cu<SUB>46</SUB>Zr<SUB>46</SUB>Al<SUB>8</SUB>. We determined the excess entropy of the glass transition in both metallic glasses to be at least 95% configurational in origin, consistent with the classic Adam-Gibbs description of the glass transition. Calorimetry and inelastic neutron scattering measurements performed during in situ heating were used to obtain the total and vibrational entropies, respectively. These results will be discussed in the context of Potential Energy Landscape theory and molecular and network glasses, which show significant contributions from vibrational entropy.
||Planned: Supplemental Proceedings volume