| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium: Thermodynamics, Phase Equilibria and Kinetics for Materials Design and Engineering
|
| Presentation Title |
Interaction of Moving Grain Boundaries with Solutes in Alloys |
| Author(s) |
Yuri Mishin |
| On-Site Speaker (Planned) |
Yuri Mishin |
| Abstract Scope |
Solutes in alloys can strongly interact with moving grain boundaries (GBs) and change their thermodynamic and kinetic properties. We apply a discrete model and a regular solution approximation to study the solute drag effect and the impact of GB motion on GB phase transformations. The model predicts all thermodynamic and kinetic properties of the moving GB, the GB phase diagram, and the solute drag force. Analysis shows that GB motion strongly affects the relative stability of GB phases and can even stabilize phases that are absolutely unstable under equilibrium conditions. In the steady-state regime, the GB phase diagram can be expanded by adding the GB speed play as another state variable. GB phase transformations are accompanied by drastic changes in GB mobility. The results are analyzed in the context of non-equilibrium thermodynamics. Results predicted by the model are compared with atomistic computer simulations of solute-boundary interactions. |
| Proceedings Inclusion? |
Undecided |