| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Temperature Creep Properties of Advanced Structural Materials
|
| Presentation Title |
Creep Simulations of Refractory High Entropy Alloys |
| Author(s) |
Xin Chen, Saro San, Fei Wang, Bai Cui, Dongsheng Li, Shanshan Hu, Xingbo Liu, David Alman, Michael C. Gao |
| On-Site Speaker (Planned) |
Michael C. Gao |
| Abstract Scope |
To improve the efficiency and decrease CO2 emissions of aviation and land-based turbines, there is a need to develop novel refractory alloys that can be operated at temperature over 1300 Celsius. Besides room temperature ductility and fracture toughness, excellent creep performance and oxidation resistance at high temperatures are also required. In this talk, ongoing research on creep simulations of refractory high entropy alloys (RHEAs), supported by ARPA-E ULTIMATE program, will be presented. A crystal plasticity constitutive model has been developed at the length scale of polycrystalline microstructures, which utilizes the MOOSE multi-physics framework to predict the thermal-mechanical properties of RHEAs as a function of temperature and applied stress. Temperature-dependent elastic constants and coefficients of thermal expansion of select RHEAs are calculated using first-principles density functional theory. The simulated yield stress and creep strain are compared with experiments where available. Strategies in improving creep performance of RHEAs will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, High-Entropy Alloys, High-Temperature Materials |