About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Mechanical Behavior at the Nanoscale VIII
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| Presentation Title |
Ductility and Brittle Fracture of Tungsten by Disconnection Pile-up on Twin Boundaries |
| Author(s) |
Omar Hussein, Nicolas Bertin, Jakub Veverka, Tomas Oppelstrup, Jaime Marian, Fadi Abdeljawad, Shen J. Dillon, Timofey Frolov |
| On-Site Speaker (Planned) |
Timofey Frolov |
| Abstract Scope |
Tungsten (W) is of interest for nuclear space power and fusion reactors due to its excellent thermo-mechanical properties and minimal hydrogen interactions, but its inherent brittleness remains a challenge. Evidence for twin boundaries (TBs) in bulk W are limited at room temperature, but recent in situ TEM loading observed their formation. The interplay between TBs, dislocations, and fracture remains poorly understood. We leverage atomistic simulations to examine the role of pre-existing dislocations and TBs on W pillar mechanical response. The results highlight TB induced weakening, with fractures initiating at and growing through free surface-TB and TB-TB intersections. The role ofTBs in fracture was probed via in situ TEM tensile loading along with ex situ characterization of bulk fracture surfaces. These experiments indicate twinning occurs around the crack tip in samples of various length scale. This work was performed under the auspices of the U.S. DOE by LLNL under Contract DE-AC52-07NA27344. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, High-Temperature Materials, Modeling and Simulation |