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Meeting Materials Science & Technology 2019
Symposium Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
Presentation Title Electric Current Annealing of Zircaloy Alloy and Associated Mechanisms
Author(s) Daudi R. Waryoba, Zahabul Islam, Baoming Wang, Aman Haque
On-Site Speaker (Planned) Daudi R. Waryoba
Abstract Scope This study presents the microstructure and mechanisms of recrystallization during electric current annealing of Zircaloy-4 alloy. The alloy was annealed in-situ a scanning electron microscope with a current density of 5x104 A/cm2 for about 15 minutes. The investigation was performed using electron backscatter diffraction (EBSD) technique. The resulting microstructure was characterized with high angle boundaries (HAGBs) and strain-free equiaxial grains that were essentially the same as that obtained with conventional thermal annealing at 600°C for 2hrs. The accelerated recrystallization during electric current annealing is attributed to the high ‘electron-wind force’ arising from the momentum transfer between conduction electrons and defects, which creates a high atomic flux along the grain boundaries. The electron-wind force specifically targets defective regions, leading to unprecedented time and energy saving. Grain boundary rotation was noted to be the main recrystallization mechanism that caused rotation-coalescence-induced grain growth. These results were supported by the molecular dynamics simulation.
Proceedings Inclusion? Planned: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Advanced In-Line Nanocrystallization of Amorphous Metal Ribbon (AMR) Alloys Through Mechanical and Electromagnetic Fields
An Irreversible Thermodynamic Perspective on Chemical Reaction Kinetics in Ceramic Processing under Resonant Microwave-fields
Characterization of the Native Thin Oxide Layer of Copper Metal Powder Sintered via Microwaves
Effect of Alternating Electromagnetic Field on Extracellular Polymeric Substances Derived from Biofilms And Its Mechanism
Effect of Pulsed Electric Current on Metastable Austenitic Steel
Effective Permittivity of Metal/Ceramic Composites and Microwave Heating Characteristics
Electric Current Annealing of Zircaloy Alloy and Associated Mechanisms
Electro-pulse and High Magnetic Field Annealing of Cold-Rolled NiFe
Exploration of Phase Transformations in alnico and its Implications for Magnetic Annealing
In-situ High Spatial Resolution Two-color Thermography in Micrwoave Selective Heating System
Locally Activated Solution Processing Would be Preferable Than General Hydrothermal/Solvothermal Processing Using Autoclaves
Magnetic Field-assisted Electrodeposition of Nickel Composite Coatings
Magnetic Field-Assisted Freeze Casting of Porous Ceramic Structures
Microwave Effects in Heterogenous Materials: A Study on Catalysis
Modeling Microstructural Evolution under Applied Magnetic Fields
P2-70: Characterization of Graphite-Si-SiC Ceamics Processed by Microwave Assisted Reactive Melt Infiltration
Proposal of Mining Method of Methane Hydrate by Microwave
Radio Frequency and Microwave Heating of Preceramic Polymers and its Application in Silicon Carbide Processing
Stage I Laser Flash Sintering
Surface-charge Mobility Theory: An Explanation for Certain "Microwave Effects"
Thermal Analysis of a High Temperature Coaxial Dielectric Test Cell
Ultrasonic and Vibration Enhanced Materials Processing
Vapor Dephosphorization Kinetics from Steel Making Slag by Microwave Rapid Heating

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