|About this Abstract
||Materials Science & Technology 2019
||Materials for Nuclear Applications
||Transmutation-induced Precipitation in Tungsten Irradiated with a Mixed Energy Neutron Spectrum
||Xunxiang Hu, Chad Parish, Kun Wang, Takaaki Koyanagi, Benjamin P. Eftink, Yutai Katoh
|On-Site Speaker (Planned)
Transmutation-induced precipitation in neutron-irradiated tungsten is an important performance concern for its application as plasma facing material in fusion reactors. In this study, segregation and precipitation of transmutant elements in single crystal and polycrystal tungsten irradiated at 460~1100°C to 0.02~2.4 displacements per atom (dpa) in the High Flux Isotope Reactor were investigated using transmission electron microscopy. The results indicated that nanoscale W-Re-Os clusters were identified in low dose regime from 0.02 to 0.44 dpa with irradiation temperature lower than 800°C while acicular-shape precipitates formed when irradiation dose is higher than 1.5 dpa. A tentative roadmap of the kinetics process of the transmutation-induced precipitation in neutron-irradiated tungsten is presented characterizing the defect features (i.e., W-Re-Os clusters and precipitates) consisting of transmutant elements in tungsten irradiated to various doses. The kinetics process of transmutant elements and radiation defects are discussed to reveal the underlying mechanisms controlling the formation of precipitates in tungsten.
||Definite: At-meeting proceedings