About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Systems for the Future of Fusion Energy
|
Presentation Title |
Strain and Thermal Gradient Effects on the Transport Properties of Intrinsic Defects and Impurities in Tungsten |
Author(s) |
Enrique Martinez Saez, Bochuan Sun, Dimitrios Maroudas, Nithin Mathew, Danny Perez, Sophie Blondel, Dwaipayan Dasgupta, Brian Wirth |
On-Site Speaker (Planned) |
Enrique Martinez Saez |
Abstract Scope |
Plasma-facing materials (PFMs) in a fusion reactor are expected to withstand stringent conditions, with high heat and particle fluxes that create strong gradients of temperature and concentration of diverse species. These species will then migrate in the presence of the afore-mentioned gradients and large strain fields. In this work, we use nonequilibrium molecular dynamics (NEMD) simulations to study the transport properties of H, He, and SIAs in the presence of a thermal gradient and different strain fields in tungsten. The NEMD simulations reveal that defects and impurity atoms tend to migrate toward the hot regions of the material (negative heat of transport). The resulting concentration profiles are in agreement with the predictions of irreversible thermodynamics. Furthermore, strain seems to play a critical role in the transport of these species significantly changing the concentration profiles. We demonstrate that the resulting steady-state profiles significantly depend on these fields. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Modeling and Simulation, Other |