About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Grain Boundary Segregation: From Quantum-Accurate Spectra to CALPHAD for Polycrystalline Materials |
Author(s) |
Christopher A. Schuh |
On-Site Speaker (Planned) |
Christopher A. Schuh |
Abstract Scope |
Although grain boundary segregation has been a core thermodynamic issue in materials design for decades, it has largely been handled qualitatively due to the vast complexity of grain boundary environments. Our group has worked to address the full polycrystalline segregation problem in a spectral manner, by surveying all the possible grain boundary sites and developing computational and machine-learning methods to assess their local segregation thermodynamics. This talk will review our efforts to address segregation enthalpy, entropy, and solute interactions in a spectral framework, and to build a large database allowing predictions for many alloys. It will also describe how these spectral databases connect with the CALPHAD approach to allow predictions of phase stability in the face of grain boundary segregation. The result is a framework that can not only predict the phases present in equilibrium, but also the grain boundary chemistry and preferred grain sizes that minimize system energy. |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Computational Materials Science & Engineering, Machine Learning |