| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phonons, Electrons and Dislons: Exploring the Relationships Between Plastic Deformation and Heat
|
| Presentation Title |
The Effects of Heating Rate on Defect Reduction by Recrystallization in Deformed Polycrystal Niobium |
| Author(s) |
E. M. Nicometo, Z. L. Thune, C. M. Edge, T. R. Bieler |
| On-Site Speaker (Planned) |
E. M. Nicometo |
| Abstract Scope |
Niobium superconducting radio frequency cavities are the central core structure of particle accelerators. When in the superconducting state, defects such as dislocations and low angle grain boundaries arising from ingot production and sheet metal processing can trap magnetic flux and dissipate energy that degrades cavity performance (and thermal conductivity). We hypothesize that a more rapid heating rate than in current use will enable recrystallization that is more effective in removing defects. Two sets of polycrystal niobium samples with different orientations with respect to the rolling direction (one each from the cavity itself and from the adjacent material trimmed before forming the cavity) were studied by analyzing local average misorientation values collected by electron backscatter diffraction analysis before and after heat treatment. By understanding how initial deformation gradients from forming influences recrystallization after heat treatment, adjustments in the process can make future cavities more consistently efficient by minimizing defects. |
| Proceedings Inclusion? |
Planned: |