Phase Transformations in Neutron-Irradiated Zircaloys

Author:

Chung HM1

Affiliation:

1. Argonne National Laboratory, Material Science and Technology Division 1 Metallurgist , , 9700 S. Cass Ave., Argonne, IL60439 .

Abstract

Microstructural evolution in Zircaloy-2 and -4 spent-fuel cladding specimens after three years of irradiation in commercial power reactors has been investigated by transmission and high-voltage electron microscopies. Two kinds of precipitates induced by the fastneutron irradiation in the reactors have been identified, that is, Zr3O and cubic-ZrO2 particles approximately 2 to 10 nm in size. By means of specimen tilting and dark-field stereomicroscopy, the bulk nature of the cubic-ZrO2 particles has been shown. The Zr(Fex,Cr1−x)2 and Zr2(Fex,Ni1−x) intermetallic precipitates normally present in the as-fabricated material virtually dissolved in the spent-fuel cladding specimens after a fast-neutron fluence of ∼4 × 1021 n/cm2 in the power reactors. The observed radiation-induced phase transformations are discussed in relation with the currently available understanding of the alloy characteristics.

Publisher

ASTM International100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959

Reference29 articles.

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3. Chung, H. M., Proceedings of the Second International Symposium on Environmental Degradation of Materials in Nuclear Power Systems—Water Reactors, Monterey, CA, 9–12 Sept. 1985, pp. 153-159.

4. Williams, C. D. and Ells, C. E., Philosophical Magazine 1478-6435, Vol. 18, 1968, p. 763.

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1. On the trigonal structure of the ζ-hydride in zirconium: A microstructural characterization approach by electron diffraction and energy-loss spectroscopy;Acta Materialia;2023-04

2. Characteristics of Hydride Precipitation and Reorientation in Spent-Fuel Cladding;Zirconium in the Nuclear Industry: Thirteenth International Symposium;2002-01-01

3. Cladding metallurgy and fracture behavior during reactivity-initiated accidents at high burnup;Nuclear Engineering and Design;1998-12

4. Effect of Irradiation on the Microstructure of Zircaloy-4;Zirconium in the Nuclear Industry: Tenth International Symposium;1994-01-01

5. Characteristics of Autoclave and In-Reactor Nodular Corrosion of Zircaloys;Zirconium in the Nuclear Industry: Ninth International Symposium;1991-01-01

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