About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Transmutation Effects in Fusion Reactor Materials: Critical Challenges & Path Forward
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Presentation Title |
Behavior of Helium Cavities in Ion-irradiated Ductile-Phase-Toughened Tungsten |
Author(s) |
Weilin Jiang, Libor Kovarik, Karen Kruska, Dalong Zhang, Dongsheng Li, Tamas Varga, Wahyu Setyawan |
On-Site Speaker (Planned) |
Weilin Jiang |
Abstract Scope |
Ductile-phase-toughened tungsten (DPT W) composites, such as W-Ni-Fe DPT W, have been investigated as a candidate material for the plasma-facing components of fusion reactors. The DPT W in this study consists of W particles embedded in a ductile-phase NiFeW matrix with a nominal composition of 90W-7Ni-3Fe by weight. Sequential irradiation with Ni⁺ and He⁺ ions was performed at 973 K to emulate high-energy neutron irradiation and transmutation effects in the material. Larger He cavities with a lower number density are observed in NiFeW than W. Cavities are aggregated preferentially along the NiFeW/W interphase boundary. Convergent-beam scanning transmission electron microscopy was applied to image He cavities at an atomic-scale resolution. The depth profiles of the cavity size/volume and number density are determined. A quantitative analysis of the He atomic density and pressure in the cavities with sizes down to only ~3 nm has been achieved using electron energy loss spectroscopy. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, High-Temperature Materials, Nuclear Materials |