About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Computational Materials Science and Engineering of Materials in Nuclear Reactors
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Presentation Title |
Density Functional Theory Study of He/H Effect in W-Ni-Fe Composite for Plasma Facing Material |
Author(s) |
Wahyu Setyawan |
On-Site Speaker (Planned) |
Wahyu Setyawan |
Abstract Scope |
Ductile-phase-toughened tungsten composites are explored as plasma-facing materials for future fusion reactors. An example composite employs a ductile face-centered cubic random solid solution of Ni-Fe-W as a binder phase for W grains. W-Ni-Fe composites with a total Ni+Fe content of 3-10 wt.% (Ni:Fe ratio of 7:3) exhibit improved fracture toughness compared to tungsten. The toughening relies on the cohesion of the interphase boundary between W grains and the binder. In fusion, plasma-facing materials are exposed to He and H isotope irradiations. Therefore, understanding the effect of such isotopes on the interphase boundaries is important. We employ density functional theory to study the He/H effect in W-Ni-Fe composites. Segregation behavior and cohesion/decohesion effect will be explored. Furthermore, simultaneous effects of displacement damage due to neutron irradiations will be considered by introducing tungsten self-interstitial atoms or vacancies at the boundaries. The effect of He/H with and without neutron irradiation will be compared. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |