| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Grain Boundaries and Interfaces: Metastability, Disorder, and Non-Equilibrium Behavior
|
| Presentation Title |
Solute Drag in Regular Solution Alloys: Self-similarity and the Role of Grain Boundary Structure |
| Author(s) |
Fadi Abdeljawad, Malek Alkayyali |
| On-Site Speaker (Planned) |
Fadi Abdeljawad |
| Abstract Scope |
Grain boundary (GB) solute segregation has been experimentally shown to mitigate grain growth and thermally stabilize the grain structures of nanocrystalline (NC) alloys. However, most studies are focused on the thermodynamic aspect of solute segregation, and the role of solute drag remains poorly understood. Herein, we develop a sharp-interface solute drag model of regular solution NC alloys, which explicitly incorporates solute-solute interactions in both the bulk grains and GBs. To account for the GB structure, an indicator function is used to describe solute-GB interactions within the GB region, which is found to capture effects such as monolayer, multilayer, and nonsymmetrical segregation. GB solute drag is shown to exhibit a self-similar behavior, where the peak solute drag scales with the GB heat of mixing. A universal solute drag-velocity relation is proposed that can be used in screening the alloy design space for the most stable NC systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Thin Films and Interfaces, Nanotechnology |