| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Aging and Compatibility: Experimental and Computational Approaches to Enable Lifetime Predictions
|
| Presentation Title |
Bimodal Microstructure Modeling due to Non-Isothermal Loading in Ni-based Single-crystal Superalloys via Phase-field Method |
| Author(s) |
Emily Dunn, Jose Dominic, Jean-Briac le Graverend |
| On-Site Speaker (Planned) |
Jean-Briac le Graverend |
| Abstract Scope |
Nickel-based superalloys are of interest due to their thermomechanical performance in high-temperature settings. Unimodal γ/γ′ microstructures are observed for temperatures lower than 950C. For higher temperatures, a dissolution from 70% volume fraction occurs. Non-isothermal loading in that regime will lead to precipitation and form small precipitates (also known as tertiary precipitates) within the γ channels where dislocations propagate. This characterizes a bimodal microstructure. The evolution of these precipitates is particularly important because they will directly interfer with dislocations depending on their sizes and modify the thermo-mechanical behavior for a period of time. By modeling the evolution of the two types of precipitates via phase-field simulations, this will allow to better ascertain the role of precipitation on the macroscopic response and, therefore, during operating conditions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Computational Materials Science & Engineering, Modeling and Simulation |