|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Thermal Property Characterization, Modeling, and Theory in Extreme Environments
||Defect Density and Annealing Kinetics Estimation Using Thermal Diffusivity Measurements from Transient Grating Spectroscopy
||Mohamed Abdallah Reza, Hongbing Yu, Kenichiro Mizohata, Felix Hofmann
|On-Site Speaker (Planned)
||Mohamed Abdallah Reza
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.