|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Application Utilizing Test Reactors, Ion Beam Facilities and Integrated Modeling
||Investigation of Helium-Defect Interactions in Tungsten through Coordinated Modeling and Experiment
||Jie Qiu, Xunxiang Hu, Brian Wirth
|On-Site Speaker (Planned)
We report results of thermal helium desorption spectroscopy and a spatially-dependent cluster dynamics model to investigate the kinetics of helium-defect interactions of helium implanted tungsten. The thermal desorption measurements were conducted as a function of the time-temperature annealing protocol (linear ramping rate of 0.5°C/s to 1600°C) on tungsten exposed to 10 keV helium implantation at fluences of 1×1019, 5×1019 and 1×1020 He/m2, respectively. The combination of the modeling and thermal desorption measurements allows identification of possible mechanisms responsible for measured helium desorption peaks. This provides an opportunity for additional microstructure characterization (e.g, neutron depth profiling) to ensure the self-consistency of the modeling predictions with the experimental results and validation of the identification of helium-defect interactions in tungsten. This presentation will provide an overview of the self-consistency of the model predictions based on the assumptions made in terms of the He-point defect binding and interaction energies, and diffusivities in tungsten.
||Planned: Supplemental Proceedings volume