About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanics at the Extremes: Bridging Length-Scales From Nanoscale to Bulk
|
| Presentation Title |
Creep Mechanisms in Low-Cr Ni Alloys for MSRs: Bridging Scales from Micron to Macroscopic |
| Author(s) |
Erik Herbert, Ryan Their, Steven Zinkle, Jay Tiley |
| On-Site Speaker (Planned) |
Erik Herbert |
| Abstract Scope |
Advanced molten salt reactor (MSR) technologies demand structural materials capable of operating in corrosive, irradiated, and high-temperature environments. A novel low-chromium nickel alloy is under development to meet these demands, targeting service temperatures up to 850°C. This work develops strength and creep models for the alloy, combining macroscopic creep testing with scanning and transmission electron microscopy to elucidate operative deformation mechanisms and predict rupture lifetimes. To extend insight across length scales, instrumented indentation creep experiments are conducted to 300°C, enabling mechanistic analysis and determination of activation parameters. Coupled with microstructural analysis, these data quantify the scale dependence of creep mechanisms and inform translation to bulk properties and performance. Comparative results from Hastelloy N and other candidate alloys are used to benchmark performance and inform a mechanistic understanding of long-term behavior in MSR environments. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Temperature Materials, Nuclear Materials |