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 |
Tracking Neutron-irradiation Induced Transmutation Using Atom Probe Tomography and Neutron Inventory Calculations |
Author(s) |
Philip Edmondson, Mark Gilbert |
On-Site Speaker (Planned) |
Philip Edmondson |
Abstract Scope |
Tungsten is proposed as a plasma-facing material for nuclear fusion reactors; however, it undergoes transmutation to other species, especially rhenium and osmium, resulting in second-phase-precipitates. Atom probe tomography/microscopy can visualize all precipitates present; however, the composition using isotope natural abundances is incorrect when examining neutron-irradiated tungsten due to high transmutation rates. Here, the time-of-flight spectrometer of the atom probe microscope is used in conjunction with neutron-inventory calculations of the experiment to examine the formation and chemistry of the second-phase-precipitates of pure tungsten neutron-irradiated to doses up to ~2 displacements per atom at temperatures above and below the vacancy-mobility temperature to investigate the effect of defect mobility on second phase formation. Transmutation-corrected atom probe tomography results suggest the composition of the precipitates is approaching that of the sigma phase, far from the compositions required to be the chi phase as suggested by analysis of the diffraction patterns in the TEM data. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Phase Transformations, Characterization |