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Growth of ZrO2 Corrosion Film on Zr-2.5%Nb Pressure Tube Alloy

Published online by Cambridge University Press:  02 July 2020

Y. P. Lin
Y. P. Lin*
Affiliation:
Materials Department, Ontario Hydro Technologies, Toronto, Ontario, M8Z 5S4, Canada
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Extract

The microstructure of Zr-2.5wt%Nb pressure tubes used in CANDU reactors consists α-Zr grains with a [110] texture in the radial direction and surrounded by a thin layer of metastable β-Zr. Information on oxide formed on β-regions have been reported. For the predominantly monoclinic ZrO2 (a=0.514, b=0.521, c=0.531nm, β=99.2°) formed α-Zr, two types of grain morphology and texture have been observed. In some areas of the oxide, columnar grains with a fibre texture exhibit no specific orientation relationship with the metal; such regions are not the subject here. Results presented here address a textured growth mode which is sensitive to the metal orientation.

Plan-view foils of oxide on the pressure tube radial-normal surface formed by a treatment of 24 hours in steam were prepared by ion-beam thinning and examined in a JEOL 2010 TEM. Selected area diffraction (SAD) and convergent beam diffraction (CBD) patterns showed that oxide growth mode was dominated by a [001] growth and consisted of a combination of orientation related [001] growth and mixed [001]/[100] growth.

Type
Oxidation, Corrosion, and Protective Coatings
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 779 - 780
Copyright
Copyright © Microscopy Society of America 1997

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References

Lin, Y.P., Proc. of 3rd Int. Conf. on Microscopy of Oxidation, Cambridge, U.K., Sept., 1996Google Scholar
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This work was supported by funding from Ontario Hydro Technologies.Technical support by J. DeLuca is gratefully acknowledged.Google Scholar