About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Developments in Advanced Nuclear Structural Materials
|
| Presentation Title |
Oxide-Dispersion-Strengthened CoCrFeMnNi High Entropy Alloys |
| Author(s) |
Xiang Zhang, Fei Wang, Gary S. Was, Bai Cui |
| On-Site Speaker (Planned) |
Xiang Zhang |
| Abstract Scope |
A nanostructured oxide-dispersion-strengthened (ODS) CoCrFeMnNi high-entropy alloy (HEA) has been synthesized by a powder metallurgy process. The thermal stability, including the grain size and crystal structure of the HEA matrix and oxide dispersions, was investigated by X-ray diffraction and electron microscopy characterizations after annealing at 900 ºC. The limited grain growth may be attributed to Zener pinning of yttria dispersions that impede grain boundary mobility and diffusivity. The high hardness was caused by both the fine grain size and yttria dispersions, which was also retained after annealing at 900 ºC. This research implies that the combination of ODS and HEA concepts may provide a new design strategy for the development of thermally stable nanostructured alloys for extreme environments. Voids were formed in NiCoCrMnFe after Fe/He dual ion irradiation at 580 ºC, while no voids were observed in ODS-NiCoCrMnFe under the same conditions, suggesting a significant improvement of void swelling resistance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Other, |