About this Abstract |
| Meeting |
TMS Specialty Congress 2026
|
| Symposium
|
4th World Congress on High Entropy Alloys (HEA 2026)
|
| Presentation Title |
Effects of Precipitate-Forming Species and Grain Refinement on the Microstructural Evolution in Neutron-Irradiated CrFeMnNi and CrFeMnNiTiAl Compositionally Complex Alloys |
| Author(s) |
Nathan Curtis, Sohail Shah, Kaustubh Bawane, Tiankai Yao, Mukesh Bachhav, Michael Moorehead, Haiming Wen, Adrien Couet |
| On-Site Speaker (Planned) |
Nathan Curtis |
| Abstract Scope |
Compositionally complex alloys (CCAs) have been proposed for advanced structural nuclear applications due to reports of enhanced irradiation tolerance compared to dilute alloys. However, results from a CrFeMnNi CCA neutron-irradiated up to 6.7 displacements per atom (dpa) at 579 °C displayed signs of phase decomposition, which may serve to worsen structural performance and irradiation tolerance over time. To further explore CCA design for advanced nuclear reactor environments, the effects of grain refinement (via high pressure torsion) and precipitation strengthening (with Ti,Al-rich L12 precipitates) on the neutron-irradiation response of the CrFeMnNi(TiAl) system were explored at 6.7 dpa and 579 °C. Results display total phase decomposition of the nanocrystalline CrFeMnNi and CrFeMnNiTiAl samples. In the coarse-grained and nanocrystalline CrFeMnNiTiAl specimens, multiple minor precipitate phases were observed, and L12 precipitates remained present post-irradiation. Transmission electron microscopy and atom probe tomography techniques were employed to characterize irradiation-induced defects and chemical ordering in both systems. |
| Proceedings Inclusion? |
Undecided |