About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmental Degradation of Multiple Principal Component Materials
|
Presentation Title |
Cold Working Enhanced Thermal Stability of Native Oxide Solar Absorbers on FeMnNiAlCr High Entropy Alloys for Concentrated Solar Power System |
Author(s) |
Xiaoxue Gao, Edwin Jiang, Andrew Pike, Ian Baker, Geoffroy T.F. Hautier, Jifeng Liu |
On-Site Speaker (Planned) |
Xiaoxue Gao |
Abstract Scope |
Cost-effective FeMnNiAlCr high entropy alloys (HEAs) have shown excellent high-temperature mechanical and chemical properties, promising to serve as tubing materials for next generation concentrated solar power system (CSP). Furthermore, its native oxides, mostly composed of Mn2O3, synergistically function as a solar absorber with ~90% solar-to-thermal conversion efficiency. However, the huge and repetitively temperature change in day-night thermal cycles of CSP systems between ~750°C and ~25°C challenges the thermal stability of native oxide solar absorbers. In this paper, we significantly improve the thermal stability of native oxide on FeMnNiAlCr HEAs by cold working and partial recrystallization to optimize the microstructures against excessive oxidation. The native oxide could maintain its optical performance after >20 day-night thermal cycles, compared to <5 cycles for reference samples. This cold work effect can be explained by enhanced diffusion pathway density for high-quality alumina formation through microstructure engineering, which helps to establish and sustain the protective layer. |
Proceedings Inclusion? |
Planned: |
Keywords |
High-Entropy Alloys, Environmental Effects, Energy Conversion and Storage |