|TUPFDV001||Effect of Heating Rate on Recrystallization in Rolled Multicrystals of Pure Niobium||396|
Funding: Supported by US Dept. of Energy award DE-SC0009960.
The performance of niobium cavities in superconducting radiofrequency particle accelerators requires nearly defect-free inner surfaces. While methods to obtain smooth inner surfaces are established, the role of metallurgical defects on superconducting performance is also important, as defects such as grain boundaries and dislocations are known to trap flux that dissipates energy and reduces efficiency. Variable microstructure and texture gradients may account for the observed variability in cavity performance, so it is hypothesized that the texture and microstructure gradients originate from the large grain size of ingots, whose influence is not completely erased in the process of making sheet metal. To examine the evolution of microstructure and texture gradients, the crystal orientations present in a cylindrical cap rolled to ~90% reduction were heat treated. Initial crystal orientations were measured before rolling, and before and after slow and rapid heating rate vacuum heat treatments.
|DOI •||reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2021-TUPFDV001|
|About •||Received ※ 23 June 2021 — Revised ※ 22 February 2022 — Accepted ※ 04 May 2022 — Issue date ※ 16 May 2022|
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