About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
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| Symposium
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Transmutation Effects in Materials in Fission, Fusion, and Spallation Environments
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| Presentation Title |
Transmutation Effects on Microstructure and Mechanical Properties of Neutron-Irradiated Tungsten |
| Author(s) |
Weicheng Zhong, Yan-Ru Lin, Akira Hasegawa, Yutai Katoh |
| On-Site Speaker (Planned) |
Weicheng Zhong |
| Abstract Scope |
Tungsten, as leading plasma-facing materials for fusion reactors, is subjected to both displacement damage and transmutation under neutron irradiation. The effects collectively govern microstructural evolution and mechanical performance. This work compares the defect formation, transmutation-induced precipitation and tensile properties of pure tungsten irradiated in the High Flux Isotope Reactor (HFIR) under thermal-neutron shielded and mixed spectrum conditions. The shielded condition provides a fusion-relevant transmutation-to-dpa ratio, approximately one order of magnitude lower than the mixed-spectrum condition. The comparison of the two conditions enables examination of transmutation (Re and Os) effects. Microstructural characterization reveals temperature-dependent evolution of dislocation loops and voids under shielded irradiation, with Re/Os segregation to voids but limited precipitation. In contrast, mixed-spectrum irradiation promotes well-defined Re/Os-rich precipitates, larger voids, and precipitation at dislocation loops. The influence of transmutation on irradiation hardening and its implications for embrittlement will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Nuclear Materials |