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Precipitation in Zr-2.5Nb During 10 MeV Electron Irradiation

Published online by Cambridge University Press:  16 February 2011

O.T. Woo ,
R.M. Hutcheon  and
C.E. Coleman
O.T. Woo
Affiliation:
AECL Research, Chalk River Laboratories, Chalk River, Ontario K0J IJO, Canada
R.M. Hutcheon
Affiliation:
AECL Research, Chalk River Laboratories, Chalk River, Ontario K0J IJO, Canada
C.E. Coleman
Affiliation:
AECL Research, Chalk River Laboratories, Chalk River, Ontario K0J IJO, Canada
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Abstract

The corrosion resistance of Zr-2.5Nb is increased by neutron irradiation at 570K. This is due to the radiation-enhanced precipitation of β-Nb within the ∝-Zr grains, and the associated reduction in the Nb concentration in the ∝-Zr matrix during irradiation. This microstructure was observed in annealed Zr-2.5Nb irradiated with neutrons at 670K and 770K, and also with protons between 770 and 720K to 0.9 dpa. In this study, the same annealed Zr-2.5Nb, in the form of four 8 mm diameter, 0.5 mm thick discs, was irradiated with 10 MeV electrons for 370 hours. The damage accumulated on the discs ranged from 0.5 to 1.2 dpa, while the temperature of each disc varied from 720K at the centre to 600K at the edge. TEM examination of the 1.2 dpa, 710K sample revealed needle-like precipitates in the ∝-Zr matrix. These precipitates, having widths of I or 2 nm and lengths up to 70 nm, were shown by EDX analysis to contain Zr and Nb. Dark field observations using a precipitate reflection confirmed that the precipitates were β-Nb with about 88 % Nb. Specimens made from the same Zr-2.5Nb that were annealed at 720K for 370 hours but unirradiated had clear ∝-Zr grain interiors, with no precipitates. Thus electron irradiation produced a microstructure similar to that produced by neutrons and protons.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 373: Symposium Y – Microstructure of Irradiated Materials , 1994 , 189
Copyright
Copyright © Materials Research Society 1995

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References

REFERENCES

1. Urbanic, V.F. and Gilbert, R.W., in High Temperature Oxidation and Sulphidation Processes, edited by Embury, J.D. (Pergamon Press 1990) p. 182.Google Scholar
2. Coleman, C.E., Gilbert, R.W., Carpenter, G.J.C. and Weatherly, G.C., in Phase Stability during Irradiation, edited by Holland, J.R., Mansur, L.K. and Potter, D.I. (AIME 1980) p.587.Google Scholar
3. Cann, C.D., So, C.B., Styles, R.C. and Coleman, C.E., J. Nucl. Mater. 205, 267 (1993).Google Scholar
4. Oen, O.S., Cross Sections for Atomic Displacements in Solids by Fast Electrons, ORNL Report # 4897 (Oak Ridge National Laboratory 1973).Google Scholar
5. Flewitt, P.E.J., J. Appl. Crystallography 5, 423 (1972).Google Scholar