| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Microstructural Evolution and Hardness Changes in Ion Irradiated Ni-based Superalloys |
| Author(s) |
Qinyun Chen, Siwei Chen, Yan-Ru Lin, Yajie Zhao, Ryan Thier, Steven Zinkle |
| On-Site Speaker (Planned) |
Qinyun Chen |
| Abstract Scope |
Nickel-based superalloys are promising structural material candidates for molten salt reactors and other advanced nuclear reactors. However, traditional Ni alloys exhibit severe mechanical degradation after neutron irradiation, and the gamma-prime precipitates in these alloys are susceptible to dissolution during irradiation. Several high-performance commercial Ni-base superalloys (solid solution-strengthened Haynes 244 and Haynes 214, precipitation-strengthened Haynes 244) were irradiated with 8 MeV Ni ions to midrange doses of 1 and 10 dpa at 600 ℃ and 750 ℃. During 750℃ irradiation to 10 dpa, the Ni2(Mo,Cr) precipitates in aged Haynes 244 exhibited remarkable stability. However, such precipitates were partially dissolved in the 600 ℃ samples. The post-irradiation nanoindentation analysis revealed significant hardening for both solution-annealed Haynes 214 and Haynes 244. TEM analysis confirmed Ni2(Mo,Cr) precipitates in irradiated regions. In addition to gamma-prime precipitates, an unidentified radiation-induced/modified phase was observed in Haynes 214. Detailed chemical composition from STEM-EDX and APT will be summarized. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Nuclear Materials, |