| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XVIII
|
| Presentation Title |
Fragility, Medium Range Order and Boson Peak in Liquids |
| Author(s) |
Chae Woo Ryu, Takeshi Egami |
| On-Site Speaker (Planned) |
Chae Woo Ryu |
| Abstract Scope |
Viscosity varies by an enormous amount, from the order of 10-3Pa.s at high temperatures to 1012Pa.s at Tg. The rate of this change near Tg defines fragility, which varies widely for different materials. To unravel the nature of fragility, particularly in the light of the relationship between fragility and the inherent structural signature, we point out the role of the medium range order (MRO) and the boson peak (BP) in liquids and glasses. Here the MRO is defined by the decay of the pair distribution function with distance and the boson peak is expressed by the excess vibrational density of states over the Debye level due to local modes. We found that strong correlation exists among fragility, the MRO, and the BP. These observations could elucidate the mechanism that controls fragility and provide a guide for designing the glasses. |
| Proceedings Inclusion? |
Planned: |