A preliminary investigation of high dose ion irradiation response of a lanthana-bearing nanostructured ferritic steel processed via spark plasma sintering

JOURNAL OF NUCLEAR MATERIALS

卷:495

Article

Pasebani, Somayeh^1,6  Charit, Indrajit^2,6  Guria, Ankan^2,6  Wu, Yaqiao^3,6  Burns, Jatuporn^3,6  Butt, Darryl P.^4,6  Cole, James I.^5,6  Shao, Lin⁷ 

[1] Oregon State Univ, Sch Mech Ind & Mfg Engn, Corvallis, OR 97331 USA

[2] Univ Idaho, Dept Chem & Mat Engn, Moscow, ID 83844 USA

[3] Boise State Univ, Micron Sch Mat Sci & Engn, Boise, ID 83725 USA

[4] Univ Utah, Dept Met Engn, Coll Mines & Earth Sci, Salt Lake City, UT 84112 USA

[5] Idaho Natl Lab, Idaho Falls, ID 83401 USA

[6] Ctr Adv Energy Studies, Idaho Falls, ID 83401 USA

[7] Texas A&M Univ, Dept Nucl Engn, College Stn, TX 77843 USA

关键词: Nanostructured ferritic steels;    ODS steels;    Lanthanum oxide;    Spark plasma sintering;    Ion irradiation;   

DOI  :  10.1016/j.jnucmat.2017.08.010

来源: Elsevier

【 摘 要 】

A nanostructured ferritic steel with nominal composition of Fe-14Cr-1Ti-0.3Mo-0.5La(2)O(3) (wt.%) was irradiated with Fe+2 ions at 475 degrees C for 100, 200, 300 and 400 dpa. Grain coarsening was observed for the samples irradiated for 200-400 dpa resulting in an increase of the average grain size from 152 nm to 620 nm. Growth of submicron grains at higher radiation doses is due to decreased pinning effect imparted by Cr-O rich nanoparticles (NPs) that underwent coarsening via Ostwald ripening. Dislocation density consistently increased with increasing irradiation dose at 300 and 400 dpa. The mean radius of lanthanum-containing nanoclusters (NCs) decreased and their number density increased above 200 dpa, which is likely due to solutes ejection caused by ballistic dissolution and irradiation-enhanced diffusion. Chromium, titanium, oxygen and lanthanum content of nanoclusters irradiated at 200 dpa and higher got reduced by almost half the initial value. The reduction in size of the nanoclusters accompanied with their higher number density and higher dislocation density led to significant radiation hardening with increasing irradiation dose. (C) 2017 Elsevier B.V. All rights reserved.

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