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ENSI Erfahrungs- und Forschungsbericht 2011

Author und Co-author(s) C. Proff and S. Abolhassani

Institution Paul Scherrer Institut

Address Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland

Tel., E-mail, Internet address Sousan Abolhassani, + 41 56 310 2191, Sousan.abolhas-

sani@psi.ch, www.psi.ch and http://lnm.web.psi.ch/

Duration of Project End 2010 to End 2012

ABSTRACT

The objective of this project is to examine the

metal-oxide interface of a number of mod-

ern zirconium based claddings, irradiated in

Halden reactor up to high burn-ups, in order

to compare the oxidation behaviour of these

materials. The aim is to correlate the micro-

structure of each cladding material to its com-

position in view of better understanding the

role of alloy composition and microstructure

on its oxidation behaviour. Four different sam-

ples have been examined this year, from three

different alloy types. The results have shown

that two types of precipitates are present in

the alloys studied, depending on the Fe con-

tent of the material. In the case of alloys show-

ing a better resistance to oxidation, the Fe con-

taining precipitate is absent or its frequency is

statistically low. It has been observed that the

Fe containing precipitate undergoes a certain

amorphization, where as the other type of pre-

cipitate, a -Nb type, does not show this be-

haviour. All precipitates show certain dissolu-

tion under irradiation; this behaviour is inten-

sified in the oxide.

Project IFA-638– TEM

Examinations of Metal-oxide

interface of Zirconium alloys

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