About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Bulk Metallic Glasses XX
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Presentation Title |
Thermodynamic Connections to the Fragility of Pt-based BMGs |
Author(s) |
Hillary Smith, Colby Stoddard, Jong H. Na, Marios Demetriou |
On-Site Speaker (Planned) |
Hillary Smith |
Abstract Scope |
A new series of bulk metallic glasses (BMGs) Pt80-xCuxCu20 were recently reported with Angell fragility parameters ranging from 73 to more than 90 [1]. The effect of fragility on thermodynamic properties in these metal/metalloid glasses has been systematically investigated using differential scanning calorimetry. The thermodynamic functions of excess enthalpy, entropy, and Gibbs free energy between the liquid and crystal phases were calculated as a function of x (Cu concentration) from the isobaric specific heat capacity measurement of the glass, crystal and liquid. The glass transition, crystallization, and liquidus temperatures, and the enthalpies of crystallization and melting were also assessed. We will discuss the correlation between fragility and excess specific heat at the glass transition. Fractional contributions of vibrational entropy to the entropy of the glass and undercooled liquid as determined from inelastic neutron scattering will also be reported.
1. Na, J.H., et al., P.N.A.S. 117, 2779 (2020). |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Characterization, |