About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Computing ternary liquid phase diagrams: Fe-Cu-Ni |
Author(s) |
Dallas R. Trinkle |
On-Site Speaker (Planned) |
Dallas R. Trinkle |
Abstract Scope |
Computing liquid phase diagrams requires accurate free energy data across composition and temperature space. Chemical potential information is often computed in atomistic simulations using the Widom approach, where an atom is virtually inserted at random locations. This converge slowly in condensed systems, as the insertion energy is often large, giving poor statistics. We demonstrate a virtual semigrand canonical Widom approach to determine differences in excess chemical potentials between different species. Using an embedded atom potential for Fe-Cu-Ni, we simulate liquid states over a range of compositions and temperatures. This raw data is then fit to Redlich-Kister polynomials with simple temperature dependence. Using the analytic form, we can determine the phase diagram for the ternary liquid, compute the miscibility gap and spinodal decomposition as a function of temperature for this EAM potential. We compare with available experimental data, and discuss the extension to first principles methods. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, |