|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIII
||Comparison of the Entropy in Cu50Zr50 and Cu46Zr46Al8
||Hillary Smith, Andrew Hoff, Chen Li, Tabitha Swan-Wood, Chae-Reem Yang, Sarah Randolph, Marios Demetriou, Brent Fultz
|On-Site Speaker (Planned)
Cu50Zr50 is among the most fragile metallic glass formers, and one of only a few binary bulk- glass forming compositions. The addition of 8% Al to the binary Cu-Zr drastically changes the shear viscosity, resulting in the strong glass former Cu46Zr46Al8. The excess entropy of the glass transition in Cu50Zr50 has been shown to be at least 95% configurational in origin, consistent with the classic Adam-Gibbs description of the glass transition. This result was achieved through calorimetry and inelastic neutron scattering measurements performed during in situ heating. The vibrational and configurational contributions to the excess entropy at the glass transition are also assessed here for Cu46Zr46Al8. The entropic contributions at the glass transition for these contrasting metallic glasses will also be discussed in the context of molecular and network glasses, which show significant contributions from vibrational entropy.
||Planned: A print-only volume