About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Local Ordering in Materials and Its Impacts on Mechanical Behaviors, Radiation Damage, and Corrosion
|
Presentation Title |
Engineering the Extent of Grain Boundary Ordering via Pre-melting in Nanocrystalline Al Alloys |
Author(s) |
Jungho Shin, Tianjiao Lei, Hannah Howard, Glenn Balbus, Timothy Rupert, Daniel Gianola |
On-Site Speaker (Planned) |
Daniel Gianola |
Abstract Scope |
Segregation-engineered nanocrystalline alloys with chemically enriched grain boundaries enable combinations of exceptional mechanical behavior and thermal stability. With judicious alloying and processing choices, these materials can also host amorphous complexions that are intrinsically stable at elevated temperatures when the disordered nanoscale interface zone can exist in equilibrium with its crystalline abutting neighbors. In this work, we demonstrate synthesis and processing routes for controlling disorder at the interfaces within segregation-engineered nanocrystalline aluminum alloys. We demonstrate that exceptional thermal stability and mechanical strength arises in several ternary aluminum alloys by promoting grain boundary pre-melting events at sub-solidus temperatures followed by subsequent cooling to the glassy state. Ultrafast differential scanning nanocalorimetry combined with electron microscopy reveals the role of cooling rate on the solidification products from the interface liquid, and a path-independence of the subsequent disordering temperatures. Finally, we discuss the implications of these disorder-engineered alloys for bulk processability with low energy budget. |
Proceedings Inclusion? |
Planned: |