Redistribution of alloying elements in Zircaloy-2 after in-reactor exposure
Artikel i vetenskaplig tidskrift, 2014

An atom probe tomography study of the microstructure of a Zircaloy-2 material subjected to 9 annual cycles of BWR exposure has been conducted. Upon dissolution of secondary phase particles, Fe and Cr are seen to reprecipitate in large numbers of clusters and particles of 1-5 nm sizes throughout the Zr metal matrix. Fe and Sn were observed to segregate to ring-shaped features in the metal that are interpreted to be -component vacancy loops. This implies that these two elements play a major role in the irradiation growth phenomenon in Zr alloys, which is believed to be caused by the formation of -loops. Similarly to autoclave-corroded Zr alloys, the formation of a sub-oxide layer of approximate composition ZrO was observed. On the other hand, no oxygen saturated metal phase was detected underneath the oxide scale.


Gustav Sundell

Chalmers, Teknisk fysik, Materialens mikrostruktur

Mattias Thuvander

Chalmers, Teknisk fysik, Materialens mikrostruktur

Pia Tejland

Studsvik Nuclear AB

Mats Dahlbäck

Lars Hallstadius

Hans-Olof Andrén

Chalmers, Teknisk fysik, Materialens mikrostruktur

Journal of Nuclear Materials

0022-3115 (ISSN)

Vol. 454 178-185





Annan materialteknik


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