| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Thermodynamics and Phase Diagrams Applied to Materials Design and Processing: An FMD/SMD Symposium Honoring Rainer Schmid-Fetzer
|
| Presentation Title |
Computational microstructural engineering for multi-phase HEAs |
| Author(s) |
Shiddhartha Ramprakash, Shalini Roy Koneru, Paraic O'Kelly, Brian Welk, Gopal Babu Viswanathan, Hamish Fraser, Yunzhi Wang |
| On-Site Speaker (Planned) |
Yunzhi Wang |
| Abstract Scope |
Most HEAs are multiphase at equilibrium. Even though some HEAs could be single-phase solid solutions at elevated temperatures, they are extremely weak during deformation such as creep. Thus, high-temperature applications require multiphase HEAs. FCC multiphase HEAs can't compete with Ni-base superalloys, and BCC multiphase HEAs are too brittle, with limited tensile data available. However, HEAs offer a vast and relatively unexplored compositional space near phase diagram centers, where diverse transformation pathways can be used to engineer new microstructures. Navigating this space experimentally is challenging. Our approach aims to develop microstructurally engineered multiphase refractory HEAs (RHEAs) by understanding composition, transformation pathways, and multiphase microstructures. Using high-throughput CALPHAD thermodynamic modeling, phase-field simulations, and experimental efforts, we identify critical alloy and processing parameters affecting microstructure development and create microstructure maps to guide experiments. Our results show a rich variety of novel two-phase microstructures can be engineered in RHEAs, potentially enhancing their mechanical properties. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, High-Entropy Alloys, Phase Transformations |