An atom probe tomography study of the chemistry of radiation-induced dislocation loops in Zircaloy-2 exposed to boiling water reactor operation

JOURNAL OF NUCLEAR MATERIALS

卷:550

Article

Eriksson, J.¹  Sundell, G.^1,3  Tejland, P.²  Andren, H-O¹  Thuvander, M.¹ 

[1] Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden

[2] Studsvik Nucl AB, SE-61182 Nykoping, Sweden

[3] Vitroprobe Analyt AB, Danska Vagen 83, SE-41659 Gothenburg, Sweden

关键词: Zirconium alloys;    Radiation damage;    Dislocation loops;    Clustering;    Boiling water reactor;    Atom probe tomography;   

DOI  :  10.1016/j.jnucmat.2021.152923

来源: Elsevier

【 摘 要 】

This study is complementary to previous atom probe tomography (APT) studies of irradiation effects in the zirconium alloy Zircaloy-2. Using APT in voltage pulse mode, a difference in morphology was ob-served between clusters of Fe and Ni and clusters of Fe and Cr in Zircaloy-2 exposed to a high fast neutron fluence in a commercial boiling water reactor. The Fe-Ni clusters were disc-shaped with a di-ameter of 5-15 nm, whereas the Fe-Cr clusters were spheroidal with a diameter of approximately 5 nm. Both types of clusters appeared to be located at irradiation-induced < a >-type dislocation loops aligned in layers normal to the < c > -direction. The concentration of Fe was higher in the Fe-Cr clusters than in the Fe-Ni clusters. The dilute Fe-Ni clusters, which seem to be segregation of Fe and Ni inside the loops, had formed on all three families of first-order prismatic planes with some deviation from perfect < c > -axis alignment. The Fe-Cr clusters might be very small precipitates with a nucleation associated with the loops. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ )

【 授权许可】

Free