期刊
JOURNAL OF NUCLEAR MATERIALS
卷 467, 期 -, 页码 97-112出版社
ELSEVIER
DOI: 10.1016/j.jnucmat.2015.09.022
关键词
Transmission electron microscopy (TEM); Atom probe tomography (APT); Oxide dispersion strengthened steel
资金
- US Nuclear Regulatory Commission [NRC-HQ-84-14-G-0056]
- US DOE, Office of Nuclear Energy under DOE Idaho Operations Office, ATR National Scientific User Facility experiment [DE-AC07-05ID14517, 14-486]
A model Fe-9%Cr oxide dispersion strengthened (ODS) steel was irradiated with protons or neutrons to a dose of 3 displacements per atom (dpa) at a temperature of 500 degrees C, enabling a direct comparison of ion to neutron irradiation effects at otherwise fixed irradiation conditions. The irradiated microstructures were characterized using transmission electron microscopy and atom probe tomography including cluster analysis. Both proton and neutron irradiations produced a comparable void and dislocation loop microstructure. However, the irradiation response of the Ti-Y-O oxide nanoclusters varied. Oxides remained stable under proton irradiation, but exhibited dissolution and an increase in Y: Ti composition ratio under neutron irradiation. Both proton and neutron irradiation also induced varying extents of Si, Ni, and Mn clustering at existing oxide nanoclusters. Protons are able to reproduce the void and loop microstructure of neutron irradiation carried out to the same dose and temperature. However, since nanocluster evolution is controlled by both diffusion and ballistic impacts, protons are rendered unable to reproduce the nanocluster evolution of neutron irradiation at the same dose and temperature. (C) 2015 Elsevier B.V. All rights reserved.
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