About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Bulk Metallic Glasses XVII
|
Presentation Title |
Effect of Thermal History on Crystallization Kinetics of a Bulk Glass-forming Liquid |
Author(s) |
Güven Kurtuldu, Jörg F. Löffler |
On-Site Speaker (Planned) |
Güven Kurtuldu |
Abstract Scope |
Initial phase selections by competing processes of nucleation and growth play a central role in the overall microstructural evolution during solidification. At high undercoolings before crystallization or devitrification of the liquid, heterogeneous nucleation on catalytic sites determines the nucleation onset and initial phase selection. While rapid quenching of the melt, glass fluxing, and containerless processing are the most commonly used methods for achieving large undercoolings, thermal cycling of the melt also reveals remarkable success. The effect of thermal cycling is generally attributed to the removal of heterogeneous nucleation sites. Here we demonstrate how thermal cycling, or more specifically thermal history, change the glass-forming ability reversibly. Fast differential scanning calorimetry is used to impose a certain thermal path to change the nucleation kinetics and to concurrently measure the critical cooling rate for glass formation before and after the thermal path. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |