About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments IV
|
| Presentation Title |
Phase-Field Modeling of the Transition From Protective External Oxides to Detrimental Internal Oxidation in Ni-Cr Alloys |
| Author(s) |
Ziming Zhong, Kumar Ankit |
| On-Site Speaker (Planned) |
Kumar Ankit |
| Abstract Scope |
Understanding oxidation in Ni-based alloys is key to developing materials for high-temperature applications. A critical concern is the transition from protective external oxides to harmful internal oxidation, driven by the interplay between oxygen diffusion and reactive phase formation. We present a CALPHAD-informed phase-field model that captures this phenomenon by coupling oxygen diffusion with thermodynamic and kinetic parameters. The model matches one-dimensional predictions from DICTRA and extends to two-dimensional simulations that reveal chromium oxide growth and linking. By varying chromium content, our results identify a compositional threshold separating external from internal oxidation regimes. This threshold correlates with precipitate distribution and size, offering a basis for alloy design strategies to suppress internal oxidation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, High-Temperature Materials, Phase Transformations |