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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Thermal Property Characterization, Modeling, and Theory in Extreme Environments
Presentation Title Thermal Transport in Irradiated ThO2: A Combined Experimental and Phonon Level Investigation
Author(s) Anter El-Azab, Walter Deskins, Maniesha Singh, Sanjoy Mazumder, Kumagai Tomohisa, Jie Peng, Marat Khafizov, Zilong Hua, Lingfeng He, David Hurley
On-Site Speaker (Planned) Anter El-Azab
Abstract Scope We present a theory driven program for predicting thermal transport in irradiated ThO2, where computational models and experiments are combined to make progress. A Boltzmann Transport Equation (BTE) approach is used to model phonon transport and interactions at the mesoscale, with input consisting of phonon dispersion relations obtained by inelastic neutron scattering measurements and strain-based models for phonon scattering by lattice defects and microstructural features. Within a Monte Carlo (MC) solution scheme, point defects are represented as continuous fields that scatter phonons everywhere in the crystal while extended defects such as dislocation loops and voids are expressed as discrete strain sources that scatter phonons in a non-uniform fashion. MC simulations of phonon transport in irradiated ThO2 are compared with Modulated Thermoreflectance measurements of conductivity in the same material. This work is performed as part of the EFRC Center for Thermal Energy Transport under Irradiation.
Proceedings Inclusion? Planned:
Keywords Nuclear Materials, Modeling and Simulation, Characterization

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A Thermodynamically-consistent Model for Heat Transport in Heterogeneous Solids
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Connection Between Thermal Conductivity Degradation and Microstructural Changes in Graphite Due to Neutron Irradiation
Defect density and annealing kinetics estimation using thermal diffusivity measurements from Transient Grating Spectroscopy
Energy Balance Investigation of Close-coupled Optimized-pressure Gas Atomization Pour-tube Design Geometry to Prevent Melt Freeze-off
Enhanced thermal conductivity for sol-gel derived fuel candidates
From crystalline to amorphous materials: mechanisms for thermal conductivity reduction
Ion-irradiation-induced structural disorder and thermal conductivity changes of intermetallic compounds.
Measurement of density, thermal expansion, and viscosity of volatile molten salts using X-ray radiography
Mesoscale Modeling of the Effective Thermal Conductivity of a UO2-Mo Composite Nuclear Fuel
Multiphysics Mesoscale Modeling of Ablative Thermal Protection Systems
Non-magnetic Kondo effect in delta-UZr2
Oxidation Resistance Impact of Niobium and Zirconium Additions to U3Si2
Performance of UO2 reactor fuel with high thermal conductivity additives
Phase-dictated thermal conductivity response in carbon systems exposed to ion irradiation
Phonon transport in ThO2 from neutron scattering and first-principles computation
Theory of non-equilibrium thermal transport at high temperatures from first-principles.
Thermal and mechanical properties of hafnon (HfSiO4), theory and experiments
Thermal behaviors of correlated insulators ThO2 and SmB6
Thermal conductivity and heat transport processes of ion irradiated and laser heated solids
Thermal Conductivity Degradation from Irradiation-induced Microstructural Defects in Single Crystal Thorium Dioxide
Thermal gradient effect on the transport properties of helium and intrinsic defects in tungsten
Thermal Resistance at a Twist Interface: Dislocation Grid and Misorientation Phonon Scattering
Thermal stability of metallic multilayers with triple junctions
Thermal Transport Behavior of U-50Zr at the Mesoscale: Before and After Irradiation
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Ultra-high lattice thermal conductivity and the effect of pressure in superhard hexagonal BC2N

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