About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Refractory Metals 2026 – A Memorial to Todd Leonhardt
|
| Presentation Title |
Impact of variations in recovery, recrystallization, and grain growth behavior on the performance of Nb accelerator structures fabricated by deep-drawing |
| Author(s) |
Shreyas Balachandran, Santosh Chetri, Trent Boritz, Peter J Lee, Pashupati Dhakal, Matthew A Carl, Nathan Lannoy, Eric M Taleff, Thomas R Bieler, Philip Eisenlohr |
| On-Site Speaker (Planned) |
Shreyas Balachandran |
| Abstract Scope |
Microstructural control in superconducting radio frequency accelerators, formed through deep drawing, is crucial for achieving the highest cryogenic performance. The currently standard heat treatment process of 3h at 800℃ has been insufficient to achieve complete recrystallization of the deformed sheet material, resulting in dissipative losses from magnetic flux trapping related to the remnant microstructure. For the first time, we demonstrate that consistently better flux expulsion performance can be achieved after heat treatments when cavity structures are fabricated from cold-worked Nb sheets, rather than from an annealed ASTM B393-18 Type 5 sheet. Improved performance and consistency are due to the better spatial microstructure control possible through recovery (Rv), recrystallization (Rx), and grain growth (GG) processes. The relations between the degree of cold work, cross-sectional microstructure, and interstitial content in the initial Nb sheets, as well as their impacts on Rv, Rx, and GG, will be discussed. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Electronic Materials, Shaping and Forming, Other |