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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2020
Presentation Title Effect of Dislocations and Grain Boundaries on Magnetic Flux Trapping in High-purity Niobium used for Superconducting Radio Frequency Cavities
Author(s) Mingmin Wang, Shreyas Balachandran, Santosh Chetri, Anatolii Polyanskii, Peter Lee, Thomas Bieler
On-Site Speaker (Planned) Thomas Bieler
Abstract Scope High-purity niobium is used for superconducting radio-frequency (SRF) cavities for particle accelerators with potential applications from water treatment to materials science. Trapped magnetic flux due to dislocations and grain boundaries in niobium can degrade the performance of SRF cavities, and hence is a scientific topic of growing interest. However, it is still unclear what defects actually trap magnetic flux, and which processing paths can minimize defects and ensure consistently high cavity performance. To investigate the mechanism of flux trapping by dislocations and grain boundaries, bi-crystal niobium samples with strategically chosen tensile axes were strained to about 5% to introduce dislocations. Electron channeling contrast imaging (ECCI) was used to characterize dislocation structures before and after the deformation, followed by magnetic flux observations at superconducting temperatures using magneto-optical (MO) imaging. The effect of dislocation density on flux trapping and conditions that increase the tendency to trap flux are discussed.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


Alloying for Precipitation Hardening in Chromium
Development of Refractory Complex Concentrated Alloys RCCAs Using Diffusion Couple Approach
Dislocation Multiplication from a Frank-Read Source in Six Body-centered Cubic Refractory Metals
Dynamic Grain Growth in Refractory Metals
Effect of Dislocations and Grain Boundaries on Magnetic Flux Trapping in High-purity Niobium used for Superconducting Radio Frequency Cavities
Effect of Strain Rate on the Anisotropic Tensile Mechanical Properties of High Purity Niobium Single Crystals
Hot Isostatic Pressing of WC-3009 Niobium-Based Refractory Alloy
Intermetallic Precipitate Reinforced Refractory Metal Alloys toward ‘bcc-superalloys’
Mechanical Testing of Tungsten-Steel Laminate Composites for use in Fusion Applications
Microstructure, Microhardness and Oxidation Behavior of Mo-Si-B alloys in the Moss+Mo2B+Mo5SiB2 Three Phase Region
Modifying Grain Boundary Cohesion in Ultra-fine Grained Tungsten and Tungsten-based Nanocomposites through Systematic Doping
Molybdenum Foil Tensile Testing
Performance of Niobium and Molybdenum Alloys for High Temperature Sensing Applications
Pressureless Sintering and Microstructure Evolution of Ultrafine-grained Tungsten
Refractory Alloys 3D Printing for Missile and Space Applications
Seeking Toughness in Mo-Si-B: Composites of Stable Oxides
Static and Dynamic Grain Growth in Niobium at 1200 to 1500℃
The Influence of Dislocation Density on Thermal Conductivity in Pure Niobium from 2-9K
Thermally Activated Deformation Processes in W-Re Alloys
ZrC-W Composites Prepared by Reactive Melt Infiltration of Zr2Cu Alloy into Binder-jet Printed WC Preforms

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