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Meeting MS&T22: Materials Science & Technology
Symposium Tackling Structural Materials Challenges for Advanced Nuclear Reactors
Presentation Title Imaging Local Vacancy Supersaturation in Metals After Corrosion in Molten Salt
Author(s) Yang Yang, Weiyue Zhou, Sheng Yin, Qin Yu, Robert Ritchie, Mark Asta, Ju Li, Michael Short, Andrew Minor
On-Site Speaker (Planned) Yang Yang
Abstract Scope Localized corrosion is a critical damage initiation step that can lead to early failure and unforeseen disasters in engineering systems. The progression of localized corrosion is often accompanied by the evolution of porosities in materials, creating internal mass-flow pathways which facilitate the ingression of the external environment into the interior of the material. Here, we discovered an extremely localized form of corrosion, which we call one-dimensional (1D) wormhole corrosion, is responsible for the fast penetration of salt in Ni-20Cr. Combining four-dimensional scanning transmission electron microscopy (4D-STEM) and density functional theory (DFT) simulation, we further developed a vacancy mapping method with nanometer spatial resolution. Using our technique, we identified that the diffusion-induced grain boundary migration (DIGM) zone is the precursor of these 1D wormholes, and it possesses a vacancy fraction up to 100 times greater than that of metals close to their equilibrium melting points.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Assessing Materials Susceptibility to Environmentally-assisted Cracking in Advanced Reactor Coolant Environments
Atomistic Calculations and Theoretical Formulations of Thermal Vacancies in Complex Concentrated Alloys
BCC CrAl Thin Film, A Solution for Next-generation High-performance Inert Gas Cooled Nuclear Microreactors
Computer Modeling of Oxidation-induced Grain Boundary Embrittlement in Nickel
Convolutional Neural Networks Screening Radiation-resistant High Entropy Alloys
Correlated Characterization of Ni-based Superalloys Corroded in Uranium-containing Molten Salt Systems
Defect Dynamics and Far-from-Equilibrium Microstructure Evolution in Concentrated Alloys
Deformation Behaviour of Ion-irradiated FeCr – A Nanoindentation Study
Electrochemical Determination Kinetic Properties of Ni2+ and Cr3+/Cr2+ in FLiNaK Molten Salt
Electrodeposition of Functionally Graded Interlayers for Enhanced Divertor/Heatsink Bonding for Fusion Reactors
Elucidating Interfacial Phenomena in Molten Salt Corroded Nickel-Chromium Alloys using Analytical Transmission Electron Microscopy
Heavy Ion Irradiation Response of an Additively Manufactured 316L Stainless Steel
Hierarchical Microstructures: A Potential Route to Enhanced Stability in Structural Materials for Advanced Nuclear Reactors
High-throughput Testing and Characterization of Materials For Nuclear Applications
High Temperature Zirconium Alloys by Titanium Analogy
ICME and ML Modeling Framework of U-10%wt Mo Fabrication Processes
Imaging Local Vacancy Supersaturation in Metals After Corrosion in Molten Salt
Impact of Chemical Short-range Order on Radiation Damage in Fe-Ni-Cr Alloys
In Situ Dual Ion Irradiation of Additively Manufactured Reduced Activation Ferritic-martensitic Steels
Interfacial Interactions between Molten Salt and Structural Materials
Investigation of Fracture Behavior of Nuclear Graphite NBG-18 Using In-situ Mechanical Testing Coupled with Micro-CT
Mechanical Behavior of Additively Manufactured Steels with Monotonic and Graded Microstructures
Mechanistic Calculation of the Effective Silver Diffusion Coefficient in Polycrystalline Silicon Carbide: Application to Silver Release in AGR-1 TRISO Particles
Microplasticity of Irradiated Inhomogeneous Alloys
Microstructural Evolution of High-throughput Additively Manufactured 316L Stainless Steel with Increasing Hafnium Dopants
Microstructural Response of HT-UPS Steel to Thermal Annealing and Neutron Irradiation
Microstructural Self-organization of Phase-separating Alloys during Irradiation into Global Compositional Patterns at Grain-Boundaries and Inside Grains
Multi-scale Modeling of the Mechanical Response of Structural Metals Subjected to Thermo-mechanical Loads and Irradiation: the Role of Microstructure.
Neutron Irradiation Effects in PM-HIP Nuclear Structural Alloys
Novel Refractory High Entropy Alloys for Applications in Extreme Environments
Phase-field Modeling of Radiation Induced Segregation for Multicomponent Alloys: Kinetic Monte Carlo and CALPHAD-Informed Simulations
Phase Field Modeling of Hot Isostatic Pressing for Joining of Dissimilar Metals
Progress Toward Additive Manufacturing of Ferritic-martensitic, In situ Tempered Steels for Nuclear Applications
Quantifying Cr and Fe Dissolution to Understand Stainless Steel Molten Salt Compatibility
Radiation Resistance of MAX and MAB Phase Materials
Structural Material Design for Power Plants Using Additive Manufacturing
Studying Microstructural Evolution in an Oxide Dispersion Strengthened 14YWT Ferritic Steel Tube Manufactured using SolidStirTM Technology
Synchrotron High-energy X-ray Studies of Nuclear Structural Materials
Understanding of Alloying Additions for Design of Gas Atomization Reaction Synthesis Produced Oxide Dispersoid Strengthened Alloys

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