About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Nanostructured Materials in Extreme Environments
|
Presentation Title |
A Grain Boundary Solute Drag in Regular Solution Alloys |
Author(s) |
Malek Alkayyali, Fadi Abdeljawad |
On-Site Speaker (Planned) |
Malek Alkayyali |
Abstract Scope |
The interaction of elemental species with grain boundaries (GBs) plays an important role in a wide range of materials phenomena. Recently, GB solute segregation has been experimentally shown to mitigate grain coarsening in nanocrystalline alloys. However, most studies are focused on the thermodynamic aspect of solute segregation, and the role of solute drag remains poorly understood. Herein, we present a solute drag model of regular solution alloys that accounts at a phenomenological level for the GB structure and its influence on segregation profiles. Further, the model incorporates solute-solute interactions in both the bulk and GBs. Our analysis reveals that solute drag is greatly influenced by the spatial concentration profile across the GB region. For example, multilayer segregation results in larger solute drag compared to the monolayer case. A universal GB solute drag-velocity relation is proposed that provides a robust fit for alloys with various chemical interactions and nominal compositions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Other |