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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


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