About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Phase Transformations and Microstructural Evolution
|
Presentation Title |
Quantifying the kinetics of defect phase transitions Through ultrafast calorimetry |
Author(s) |
William S. Cunningham, Tianjiao Lei, Hannah C. Howard, Timothy J. Rupert, Daniel S. Gianola |
On-Site Speaker (Planned) |
William S. Cunningham |
Abstract Scope |
A grain boundary confined disordered phase, termed an amorphous defect phase (ADP) or complexion, can be realized in a number of solute-segregated nanocrystalline alloys. Investigation of such ADP- containing systems have led to the realization of novel alloys with increased thermal stability, mechanical properties, and radiation tolerance. In this study, we explore the grain boundary confined order-to-disorder transitions of four ADP-containing alloys, Al-Ni, Al-Y, Al-Ni-Y, and Al-Mg-Y. Using ultrafast differential scanning calorimetry with correlated transmission electron microscopy, we investigate the signatures that indicate the presence of ADPs and probe the underlying material characteristics that promote ADP formation. Through targeted isothermal annealing studies, we quantify the kinetics associated with the disorder-to-order transition and determine the critical cooling rate for kinetically quenching ADPs. The results of this work further develop our understanding of the underlying thermodynamics and kinetics that drive ADP formation, enabling novel defect engineering materials design strategies. |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Aluminum, Characterization |