Abstract
Molybdenum alloys are candidate materials for high heat flux components of fusion reactors. In order to study the neutron irradiation damage at high fluence levels, disks of the molybdenum alloy TZM that had been stress relieved at 1199 K for 0.9 ks were irradiated in the FFTF/MOTA at 679, 793 and 873 K to a neutron fluence of 9.6×10 26 n/m 2 (E n >0.1 MeV). Defect microstructures were observed by transmission electron microscopy. Dislocation structures consisted of isolated loops, aggregated loops (rafts) and elongated dislocations. The size of the loops increased with the irradiation tempetature. The levels of void swelling were 0.68 and 1.6% at 793 and 873 K, respectively
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