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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2016
Presentation Title Introduction of Precisely Controlled Microstructural Defects into SRF Cavity Nb Sheet and Their Impact on Local Superconducting Properties
Author(s) Mingmin Wang, Di Kang, Zuhawn Sung, Peter J. Lee, Anatolii A Polyanskii, Christopher C. Compton, Thomas R. Bieler
On-Site Speaker (Planned) Mingmin Wang
Abstract Scope Formation of a SRF cavity from Nb sheets introduces microstructural defects such as dislocations and low-angle grain boundaries that can become favorable sites for pinning centers for magnetic flux, which degrades cavity performance. Therefore, effects of grain boundaries on magnetic flux behavior in strained bicrystal Nb samples were investigated. Laue X-ray and electron backscattered diffraction (EBSD) mapping were used to characterize microstructural defects and to assess which grain boundaries and orientations will produce model defects after tensile deformation similar to that expected in forming cavities made from large grain material. Grain boundaries and orientations were chosen to favor specific slip systems, which generate dislocations with special angles with respect to the grain boundaries of the bicrystal Nb samples. The generated defect structures were characterized using EBSD and electron channeling contrast imaging. Cryogenic magneto-optical imaging was used to directly observe the penetration of magnetic flux into the deformed Nb.
Proceedings Inclusion? Planned: A print-only volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Effect of Silicon on Texture of Niobium
Etched Surface of CVTD Single Crystal Tungsten Coating after Serving under High Temperature
Fracture of Severely Plastically Deformed Niobium and Tantalum
High Temperature Properties of Directionally Solidified Nb-rich Nb-Si-Cr Eutectics
Improving the Performance of Nb-Silicide Based Refractory Alloys through a Novel Cold Crucible Directional Solidification
Influences of Rare Earth on Microstructures and Mechanical Properties of Functionally Graded Cemented Carbides
Introduction of Precisely Controlled Microstructural Defects into SRF Cavity Nb Sheet and Their Impact on Local Superconducting Properties
Manufacturing of Bulk Ultrafine Grain Tungsten from Nanocrystalline Tungsten Powder and Its Potential Application for Nuclear and Fusion Reactors
Mechanical Properties of Cold-rolled Tungsten at Different Strain Rates
Micro-Mechanical Characterization of Micro-Architectured Refractory Metal Coatings
Micromechanical Testing of Multi Compositional Tungsten Thin Film Alloys
Microstructure and Properties of a Ternary Eutectic Mo-Si-B Alloy
On Plasticity of Polycrystalline Rhenium at Room Temperature
Reactive Spark Plasma Sintering of Tungsten Borides Using Elemental Tungsten and Boron Powders
Size Effect of Intermetallic Compounds on Fracture Toughness of Mo-Si-B Alloys
Stress Accommodation in Plastic Zone Ahead Crack Tip in Iridium
The Initiation and Propagation of Dynamic Abnormal Grain Growth in Refractory Metals
Thermally Activated Deformation Processes in Body-Centered Cubic Cr – How Microstructure Influences Strain-Rate Sensitivity

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