Journal Published Online: 01 June 2005
Volume 2, Issue 6

TEM Examinations of the Metal-Oxide Interface of Zirconium Based Alloys Irradiated in a Pressurized Water Reactor

CODEN: JAIOAD

Abstract

Metal-oxide interfaces of three different materials irradiated in a pressurized water reactor have been analyzed by TEM and AEM. Standard Zircaloy-4, low-tin Zircaloy-4, and Zr-2.5%Nb were used for this study. The microstructure of the material on the two sides of the metal-oxide interface, the geometry of the interface, the distribution of different alloying elements, and the oxygen profile have been examined in each material. Results of the examinations showed that the three materials had different microstructure and oxygen distribution on the two sides of the metal-oxide interface. In particular, the following parameters were noticed: a) the geometry of the interface seems to be of a different nature in the case of Zr-2.5%Nb alloy. Unlike the Zircaloy-4 alloys, which show an undulated interface, this material has a “jigsaw” type interface. This point is discussed, and its role on the oxidation is considered. b) Hydrides are observed and analyzed in the vicinity of the interface in the case of low-tin Zircaloy-4, and it is shown that they can have an influence on the occurrence of cracks in this material. c) The origins of stress are discussed, and it is shown that it can have different sources. The crystal structure of the oxides is mainly monoclinic. A tetragonal oxide is observed at some regions, in particular in the standard Zircaloy-4.

Author Information

Abolhassani, S
Paul Scherrer Institut, Laboratory for Materials Behaviour, Switzerland
Restani, R
Paul Scherrer Institut, Laboratory for Materials Behaviour, Switzerland
Rebac, T
Paul Scherrer Institut, Laboratory for Materials Behaviour, Switzerland
Groeschel, F
Paul Scherrer Institut, Laboratory for Materials Behaviour, Switzerland
Hoffelner, W
Paul Scherrer Institut, Laboratory for Materials Behaviour, Switzerland
Bart, G
Paul Scherrer Institut, Laboratory for Materials Behaviour, Switzerland
Goll, W
Framatome ANP GmbH, Erlangen, Germany
Aeschbach, F
Kernkraftwerk Gösgen-Däniken, Switzerland
Pages: 25
Price: $25.00
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Stock #: JAI12390
ISSN: 1546-962X
DOI: 10.1520/JAI12390