About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2026 – A Memorial to Todd Leonhardt
|
| Presentation Title |
Assessment of the Homogeneity of Recrystallization and Microstructure in Formed High-RRR Niobium 1.3 GHz Half-Cells for Superconducting Radiofrequency Applications |
| Author(s) |
Zackery L. Thune, Shreyas Balachandran, Thomas R. Bieler |
| On-Site Speaker (Planned) |
Zackery L. Thune |
| Abstract Scope |
Advancements in accelerator performance and technology rely on consistent production of high-RRR niobium cavities. Production of these cavities requires deformation processing and strategic heat treatments. However, the properties and performance of these cavities vary significantly. Improved cavity performance is often observed with higher heat treatment temperatures resulting in more recrystallization and grain growth that reduces crystal defects that degrade performance. Recent electron backscatter diffraction analysis on cold-rolled high-RRR niobium has shown that the recrystallized fraction is strain path dependent. To assess this in a formed niobium half-cell, the effects of heating rate (5 and 250°C/min), annealing temperature (800 and 900°C), strain path, and strain magnitude on the microstructure were quantitatively assessed on sections 0°, 45°, and 90° from the rolling direction in samples from the iris, equator, and a lesser-strained region. Insights gained from these microstructural observations can guide novel heat treatment strategies that enable consistently higher cavity performance. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Characterization, Other, Other |