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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Solid State Precipitation
Presentation Title Investigating the Formation Path of Delta Hydrides in Zirconium Fuel Rod Claddings by Multi-Phase Field Modeling
Author(s) Jacob Bair, Mohsen Asle Zaeem
On-Site Speaker (Planned) Mohsen Asle Zaeem
Abstract Scope Precipitation of ζ, γ, and δ hydride phases in nuclear fuel claddings is studied by developing a multi-phase field model. Non-conservative structural field variables are used to represent each phase including α-Zr matrix, ζ-hydrides, γ-hydrides (one structural field variable for each of the three orientation variants), and δ-hydrides. Concentration of Hydrogen is controlled using a conserved field variable. The Ginzburg-Landau and Cahn-Hilliard equations are used for the evolution of field variables and concentration, respectively, and the mechanical equilibrium equations are imposed to consider the effects of elastic strain energy. Results from simulations both in the basal plane and perpendicular to the basal plane with and without applied stresses indicate that the initial morphology of δ hydrides is significantly dependent on the intermediate phases. Simulations conducted including only α and δ phases showed significantly different results from simulations including the intermediate phases.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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Formation of Complex Intermetallic Phases from Supersaturated Co Solid Solution in a Co-3.9Nb Alloy
Hydride Precipitates in Zirconium Alloys: Evolution of Dissolution and Precipitation Temperatures during Thermal Cycling Correlated to Microstructure Features
Investigating the Formation Path of Delta Hydrides in Zirconium Fuel Rod Claddings by Multi-Phase Field Modeling
Kinetics of Discontinues Precipitation upon Age-hardening of Deformed and Recrystallized Invar-Sn Alloys
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