Microstructural stability of a self-ion irradiated lanthana-bearing nanostructured ferritic steel
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2015 Elsevier B.V. All rights reserved. Thermally stable nanofeatures with high number density are expected to impart excellent high temperature strength and irradiation stability in nanostructured ferritic steels (NFSs) which have potential applications in advanced nuclear reactors. A lanthana-bearing NFS (14LMT) developed via mechanical alloying and spark plasma sintering was used in this study. The sintered samples were irradiated by Fe2+ ions to 10, 50 and 100 dpa at 30 C and 500C. Microstructural and mechanical characteristics of the irradiated samples were studied using different microscopy techniques and nanoindentation, respectively. Overall morphology and number density of the nanofeatures remained unchanged after irradiation. Average radius of nanofeatures in the irradiated sample (100 dpa at 500C) was slightly reduced. A notable level of irradiation hardening and enhanced dislocation activity occurred after ion irradiation except at 30C and 50 dpa. Other microstructural features like grain boundaries and high density of dislocations also provided defect sinks to assist in defect removal.
JOURNAL OF NUCLEAR MATERIALS
author list (cited authors)
Pasebani, S., Charit, I., Burns, J., Alsagabi, S., Butt, D. P., Cole, J. I., Price, L. M., & Shao, L.
complete list of authors
Pasebani, Somayeh||Charit, Indrajit||Burns, Jatuporn||Alsagabi, Sultan||Butt, Darryl P||Cole, James I||Price, Lloyd M||Shao, Lin