| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials and Chemistry for Molten Salt Systems
|
| Presentation Title |
Microstructural stability, hardness change, and helium behavior of dual ion-irradiated Ni-base alloys for molten salt reactor applications |
| Author(s) |
Ryan Thier, Jaimie Tiley, Bruce Pint, Ryan Gordon, Kumar Sridharan, Steven Zinkle |
| On-Site Speaker (Planned) |
Ryan Thier |
| Abstract Scope |
Due to Hastelloy® N’s limited strength above 600°C, higher-creep-strength nickel alloys with adequate corrosion resistance are desirable. Additionally, production of transmutant helium is expected to contribute to high-temperature embrittlement unless the gas atoms are successfully trapped at microstructural sinks. Two high-creep strength novel Ni-7%Cr-base alloys containing carbide and gamma prime precipitates, respectively, have been dual ion-irradiated with 8 MeV Ni and 3.55 MeV He ions at temperatures of 600 and 750°C to midrange damage levels of 10 and 30 DPA on both unstressed specimens as well as specimens tensile stressed to 138 MPa. Strength changes were assessed using pileup-corrected nanoindentation. Microstructural changes in size and number density of second phases as well as He bubble density and morphology were examined with TEM techniques in the midrange safe analysis region. The radiation resistance of the alloys and helium behavior under various conditions will be discussed, along with potential upper-use temperature. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Other |