About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XVII
|
Presentation Title |
The Physics of an Elemental Ag Glass: First Order Glass Transition and Melting |
Author(s) |
Qi An, William L Johnson, Konrad Samwer, Sydney L. Corona, William A Goddard |
On-Site Speaker (Planned) |
Qi An |
Abstract Scope |
The glass transition is ubiquitous, while the nature of the glass state has been long been debated. Here, we examined elemental Ag liquid using molecular dynamics (MD) simulations from which the metastable glass state can be achieved in the simulation time scale of nanoseconds. Our MD simulations proof that the glass transition in these liquid metals is a 1st order freezing transition from a high temperature liquid-like disordered phase to a heterogeneous, elastically rigid, low temperature solid-like phase. The robust metastability of glass phase in the MD simulations enables us to apply thermodynamic principles to construct a glass-crystal-liquid phase diagram over a broad range of temperature, as well as the time-temperature-transformation diagrams for nucleation of glass from the liquid, and crystal from the glass. We propose that the first order character of the glass transition is fundamentally linked to the emergence of long-range elasticity and elastic interactions in the glass. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |