| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Computational Thermodynamics and Kinetics
|
| Presentation Title |
Features of Defects Diffusion in Concentrated Alloys: Percolation, Sluggish and Chemically Biased Atomic Transport |
| Author(s) |
Osetsky Yury, Alexander Barashev, Laurent Béland, Yanwen Zhang |
| On-Site Speaker (Planned) |
Osetsky Yury |
| Abstract Scope |
Concentrated single-phase solid solutions represent a new class of materials with fascinating properties many of which are attributed to the sluggish atomic-level diffusion and transport. The origin and controlling mechanisms of sluggish diffusion were recently studied for the case of point defect migration. We review the main results on atomistic modeling of diffusion via point defects migration in Ni-Fe model alloys. We have found that chemical properties and percolation effects lead to sluggish and chemically biased atomic transport. Moreover, adding a fast diffuser can result in significantly slower diffusion, going against simple assumptions. These mechanisms affect microstructure evolution under different and lead to a number of new phenomena such as segregation bias and formation new, sometime thermodynamically non-equilibrium, phases.
This work was supported by the Energy Dissipation to Defect Evolution (EDDE), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |