| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Purveyors of Processing Science and ICME: A SMD Symposium to Honor the Many Contributions of Taylan Altan, Wei Tsu Wu, Soo-Ik Oh, and Lee Semiatin
|
| Presentation Title |
Heterogeneous Deformation during Forming of Pure Niobium and its Influence on Superconducting Radio Frequency Cavity Performance |
| Author(s) |
Thomas R. Bieler, Mingmin Wang, Di Kang, Mengge Zhao, Kaige Zheng, Maria Terol, Ricardo Rodriguez, Eureka Pai, Philip Eisenlohr |
| On-Site Speaker (Planned) |
Thomas R. Bieler |
| Abstract Scope |
Superconducting Radio Frequency niobium cavities are the core structure of particle accelerators. These cavities are assembled from deep drawn parts welded together. Though the cavities are structural in that they support the pressure of liquid helium, they are primarily a functional material to provide the oscillating currents that accelerate particles. The fabricated cavity must have as few defects as possible, as defects such as impurities, grain boundaries, and dislocation substructure can trap magnetic flux and cause local heating that degrades cavity performance. Primary processing starting with ingots with large (10-1000 mm) grains are used to form sheet metal, resulting in highly variable microstructures. There is a need to understand why the microstructure is so variable, and if this is the source of unpredictable cavity performance. Heterogeneous deformation resulting from tensile and rolling deformation of single and multicrystals, and the effect of original crystal orientation on recovery and recrystallization is examined. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |