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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Thermal Property Characterization, Modeling, and Theory in Extreme Environments
Presentation Title Defect Density and Annealing Kinetics Estimation Using Thermal Diffusivity Measurements from Transient Grating Spectroscopy
Author(s) Mohamed Abdalla Reza, Hongbing Yu, Kenichiro Mizohata, Felix Hofmann
On-Site Speaker (Planned) Mohamed Abdalla Reza
Abstract Scope Irradiation damage significantly changes the properties of tungsten, the main candidate material for fusion reactor armor. Using transient grating spectroscopy (TGS) we study the reduction of thermal diffusivity in self-ion implanted tungsten from 0.0001 to 10 dpa. A kinetic theory (KT) model is used to estimate the irradiation-induced point defect density from the measured thermal diffusivity data. This is compared to prior molecular dynamics (MD) simulations and TEM observations of ion-irradiation-induced defects in tungsten. Since we have proven the capability of TGS with the KT model in providing defect density estimates on room temperature samples, this is extended to samples that are annealed in-situ. This is possible due to the invariance of the TGS method with respect to sample temperature and implemented using a TGS setup with in-situ heating up to 800 C. Hence, annealing kinetics of the irradiation induced defect populations are studied utilizing TGS with in-situ heating capabilities.
Proceedings Inclusion? Planned:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

First-principles Modeling of High Temperature Irradiation Resistant Thermocouple (HTIR-TC) Performance and Oxidation
A Thermodynamically-consistent Model for Heat Transport in Heterogeneous Solids
An Experimentally Validated Mesoscale Model for the Effective Thermal Conductivity of U-Zr Fuels
Atmosphere Controlled Thermogravimetric Analysis as a Tool to Screen, Test and Qualify Advanced Fuels under Extreme Conditions
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
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 Eelta-UZr2
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 Stability of Metallic Multilayers with TripleJjunctions
Thermal Transport Behavior of U-50Zr at the Mesoscale: Before and After Irradiation
Thermal Transport in Irradiated ThO2: A Combined Experimental and Phonon Level Investigation
Ultra-high Lattice Thermal Conductivity and the Effect of Pressure in Superhard Hexagonal BC2N

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