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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Thermo-mechanical Response of Materials with Special Emphasis on In-situ Techniques
Presentation Title In-situ ECCI Characterization of Microstructural Defects and their Effect on Superconducting Properties of SRF Cavity Niobium
Author(s) Mingmin Wang, Shreyas Balachandran, Santosh Chetri, Anatolii A Polyanskii, Peter J Lee, Christopher C Compton, Thomas R Bieler
On-Site Speaker (Planned) Mingmin Wang
Abstract Scope Microstructural defects such as dislocations and grain boundaries in high purity niobium can degrade superconducting cavity performance by trapping magnetic flux, degrading thermal conductivity, and perturbing superconducting currents. Understanding the relationship between microstructural defects and their influence on magnetic flux behavior in niobium is necessary to reduce performance variability. In this study, seven bi-crystal tensile samples were extracted on strategically chosen grain boundaries from two niobium slices. Electron Channeling Contract Imaging (ECCI) was performed to evaluate dislocation structure evolution in samples deformed to 5% strain in-situ in a SEM. Samples for Magneto-Optical Imaging (MOI) extracted from the tensile samples enabled visualization of magnetic flux penetration with a magnetic field applied below the critical temperature, such that the effect of grain boundaries and dislocations on the superconducting properties can be evaluated. Research supported by DOE/OHEP contracts DE-SC0009962, DE-SC0009960, NSF- DMR-1157490, and the state of Florida.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

An Analysis of Thermo-mechanical Fatigue Crack Growth in the Titanium Alloy Ti-6246
Analysis of Longitudinal Twinning in 𝛾-TiAl by Micropillar Compression up to 700 C with Strain and Crystal Orientation Mapping
Combinatorial In Situ Micromechanics of the Al-Cu System at Low Temperatures
Deformation Mechanisms of Cu/Nb Nanoscale Metallic Multilayers as a Function of Temperature and Layer Thickness
Deformation of Monatomic Metallic Glasses Processed through In-situ Ultrafast Liquid Quenching
Design and Fabrication of MEMS-based Symmetric Structure for In-situ Nanomechanical Tensile Experiments
Developing Thermo-mechanical Fatigue Crack Growth Techniques
Emergence and Progression of Abnormal Grain Growth in Minimally Strained Nickel-200
Experimental Techniques to Asses Long Range Internal Stresses in Plastically Deformed Crystalline Solids
High-resolution Digital Image Correlation: Advances in Quantifying the Strain Distribution at the Submicron–scale in Hexagonal Materials
High throughput Study of Underlying Mechanisms of Serrated Flow in Nickel-based Diffusion Multiple via High Temperature Nanoindentation
In-situ Deformation and Characterisation of Carbon Controlled Steels
In-situ ECCI Characterization of Microstructural Defects and their Effect on Superconducting Properties of SRF Cavity Niobium
In Situ Observation on Temperature Dependence of Martensitic Transformation and Plastic Deformation in Superelastic NiTi Alloy
In Situ TEM Imaging and Quantitative Orientation Mapping of the Structural Evolution in Nanocrystalline Metals during Mechanical Deformation
Investigating Irradiation Creep by In Situ TEM
Local Dislocation Configurations and their Contribution to Early Stage Globularization in Alpha Beta Titanium Alloys
Mechanical Behavior of Stainless Steel 709 through In-situ Synchrotron Diffraction
Mechanics of Irradiated Alloys Studied through In Situ TEM Testing
Metals under High-pressure, High Temperature and during Plastic Deformation: In-situ Studies of Thermo-mechanical Response by Neutron and Synchrotron Quantum Beams
Nanomechanical Properties of Graphene Oxide and Carbon Nanotube Scaffolds
Order-disorder Transition in 18-carat Gold Studied by In Situ X-ray Scattering
Phase Transformation during Thermal Treatment of Medium Mn Steels Studied by In-situ Synchrotron Experiments and Thermodynamic Modeling
Predicting Bulk Mechanical Properties of Ferritic-martensitic Steel Using In-situ TEM Tensile Experiments and Crystal Plasticity Modeling
Rationalization of Heterogeneous Creep Deformation Behavior of Dissimilar Metal Welds
Real Time 3-D X-ray Computed Micro-tomography Study of the Strength and Toughness of Nuclear Graphite between 25° and 1000°C
Size Effects in Ion-irradiated 800H Steel at High Temperatures Utilizing Microcompression Testing
Studying Tensile Properties of Silicon via In-situ Microcompression Testing of Push-to-pull Pillar
Studying the Micromechanics of Martensitic Phase Transformatons Using High Energy Diffraction Microscopy
The Effect of Strain Rate on the Tensile Properties of Single Crystal Ni – an In Situ Study
“In Situ” Measurement of Electrical Resistivity, Dilatometry and Thermal Analyses of Cast Iron

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