| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments
|
| Presentation Title |
Examining the Contribution of Solute Nano-clustering in MA957 to Neutron Irradiation Induced Hardening and Embrittlement |
| Author(s) |
Samara Michelle Levine, Steven J Zinkle, Jonathan D Poplawsky, David T Hoelzer, Arunodaya Bhattacharya |
| On-Site Speaker (Planned) |
Samara Michelle Levine |
| Abstract Scope |
Radiation hardening and embrittlement of the first wall/blanket (FW/B) structure is expected to limit the lower operating temperature for fusion reactors. Despite oxide dispersion strengthened (ODS) steels being a leading candidate material for the FW/B, their low temperature hardening and embrittlement behavior remains an open question. Here, the relationship between microstructure and mechanical properties will be presented for ODS variant MA957 that was neutron irradiated in the High Flux Isotope Reactor at 287°C to 500°C (5.1 – 51.5 dpa). The development of Cr- and Ni-Ti-rich solute nano-clusters as a function of irradiation temperature and dose is characterized by atom probe tomography and compared to uniaxial tensile and Vicker’s hardness results through the dispersed barrier hardening model. Hardening and embrittlement is shown to persist over the entire temperature range with Cr-rich solute clusters providing the main contribution. The effect of solute additions on Cr solubility will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Iron and Steel, Characterization |