| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Meeting Materials Challenges for the Future of Fusion Energy
|
| Presentation Title |
Defect Phase Diagrams and Structure-Property Relationships for Screw Dislocations of Tungsten in the Presence of Hydrogen Studied by Atomistic Simulations |
| Author(s) |
Benjamin Helman, Adib Samin |
| On-Site Speaker (Planned) |
Benjamin Helman |
| Abstract Scope |
Tungsten is a candidate plasma facing material for future fusion reactors and it is important to characterize the effect of hydrogen on its mechanical performance. This work reports on the structure-property relationships for the tungsten-hydrogen system through the utilization of atomistic simulations with a focus on screw dislocations. In particular, simulations are conducted in the grand canonical ensemble and a phase diagram local to the 1/2<111> screw dislocation in body-centered cubic (bcc) tungsten is constructed by monitoring the segregation of hydrogen to the dislocation for a variety of temperatures and hydrogen partial pressures. The effect of the hydrogen segregation on the dislocation core structure is examined. Finally, and for structures sampled from equilibrium, the mobility of screw dislocations is examined by applying a shear stress and recording the critical resolved shear stress (CRSS) as a function of hydrogen segregation to the dislocation. |
| Proceedings Inclusion? |
Planned: |