| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Nanostructured Materials in Extreme Environments II
|
| Presentation Title |
The Role of Twin Boundaries and Pre-existing Dislocations on the Mechanical Behavior of Tungsten |
| Author(s) |
Omar Marwan Hussein, Tomas Oppelstrup, Fadi Abdeljawad, Timofey Frolov |
| On-Site Speaker (Planned) |
Omar Marwan Hussein |
| Abstract Scope |
Recent advances in additive manufacturing have enabled the fabrication of brittle, high-temperature refractory materials such as Tungsten (W). W offers potential for nuclear space power and fusion reactors due to its excellent thermal conductivity, strength, and minimal hydrogen interactions. While twin boundaries (TBs) are uncommon in W, recent experiments revealed that various mechanisms, such as dislocation and twinning, dominate the deformation of W nanowires at different loading directions. However, the interplay between TBs, dislocations, and free surfaces remains poorly understood. Herein, we leverage atomistic simulations to examine the role of pre-existing dislocation and TBs on the mechanical behavior of W nanowires. Our results highlight a weakening effect of TBs on W nanowires, with fractures initiating and growing through dominant cracks at the free surface-TB and TB-TB intersections. Observing that the high density of pre-existing dislocations improves ductility, this work provides avenues to enhance the mechanical behavior of W nanowires. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Mechanical Properties, Nuclear Materials |