| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Bulk Metallic Glasses XIX
|
| Presentation Title |
Inside Glass Tormation: The Pathway of Metallic Liquids to Vitrification Monitored in Situ by Ultrafast High-energy Synchrotron X-ray Diffraction |
| Author(s) |
Martin E. Stiehler, Mark R. Jolly, Konstantinos Georgarakis |
| On-Site Speaker (Planned) |
Martin E. Stiehler |
| Abstract Scope |
Liquid metallic melts can be vitrified into glasses when cooled fast enough to avoid crystallisation. The mystery of glass formation lies in the contrast between only very subtle changes in the atomic structure and the accompanying increase of viscosity by many orders of magnitude. Additionally, further intriguing phenomena like liquid-liquid crossovers occur along the pathway to vitrification. Here we discuss structural changes in aerodynamically levitated samples of metallic-glass-forming liquids observed in situ by ultrafast high-energy X-ray diffraction from temperatures well above the liquidus temperature to below the glass-transition temperature. This enables a detailed investigation of the miniscule changes of the atomic arrangements leading to the tremendous slowdown of the kinetics during vitrification. Analysis of the short- and medium-range order indicates temperature dependent structural changes pointing to liquid-liquid crossovers. The temperature dependence of structural metrics can also help to clarify the influence of global electronic effects on glass formation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Characterization, Other |