The formation of bubbles in Zr alloys under Kr ion irradiation

L. Pagano; A. T. Motta; R. C. Birtcher

doi:10.1016/S0022-3115(96)00757-X

The formation of bubbles in Zr alloys under Kr ion irradiation

L. Pagano, A. T. Motta, R. C. Birtcher

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Abstract

We report here a study of Kr ion implantation and resultant bubble formation in Zr and Zr alloys, including Zircaloy-2 and Zircaloy-4. Implantations into thin foils were performed in-situ in the HVEM/Tandem facility at Argonne National Laboratory at temperatures between 300 to 800°C and to doses up to 2 X 10²⁰ ion m^-2. Bulk specimens were implanted in an ion-beam chamber and then thinned for viewing by TEM. In thin foils, only small bubbles (3-10 nm) were formed at all temperatures with the exception of the Cr-rich Valloy where 13 nm bubbles were formed. Bulk samples implanted at 300°C contained a bubble morphology similar to that observed after implantation into thin foils. However at high temperatures (500-800°C) large faceted bubbles (up to 30 nm) were produced in bulk specimens. The results indicate that bubble formation and evolution below 500°C is controlled by gas concentration, while it is controlled by bubble mobility at high temperatures.

Original language	English (US)
Pages (from-to)	295-304
Number of pages	10
Journal	Journal of Nuclear Materials
Volume	244
Issue number	3
DOIs	https://doi.org/10.1016/S0022-3115(96)00757-X
State	Published - Apr 11 1997

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
General Materials Science
Nuclear Energy and Engineering

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10.1016/S0022-3115(96)00757-X

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title = "The formation of bubbles in Zr alloys under Kr ion irradiation",

abstract = "We report here a study of Kr ion implantation and resultant bubble formation in Zr and Zr alloys, including Zircaloy-2 and Zircaloy-4. Implantations into thin foils were performed in-situ in the HVEM/Tandem facility at Argonne National Laboratory at temperatures between 300 to 800°C and to doses up to 2 X 1020 ion m-2. Bulk specimens were implanted in an ion-beam chamber and then thinned for viewing by TEM. In thin foils, only small bubbles (3-10 nm) were formed at all temperatures with the exception of the Cr-rich Valloy where 13 nm bubbles were formed. Bulk samples implanted at 300°C contained a bubble morphology similar to that observed after implantation into thin foils. However at high temperatures (500-800°C) large faceted bubbles (up to 30 nm) were produced in bulk specimens. The results indicate that bubble formation and evolution below 500°C is controlled by gas concentration, while it is controlled by bubble mobility at high temperatures.",

author = "L. Pagano and Motta, {A. T.} and Birtcher, {R. C.}",

note = "Funding Information: The authors would like to thank Ed Ryan, Loren Funk, Peter Baldo, and Stan Ockers of the HVEM/Tandem Facility in the Center for Electron Microscopy at Argonne National Laboratory (ANL) for their expert technical assistance in performing the irradiations. The assistance of Bernie Kestel, also of ANL in TEM sample preparation is greatly appreciated. We thank Ron Adamson of General Electric, Vallecitos, for furnishing the Zr alloys for this study. We acknowledge helpful discussions with L.M. Howe. L. Pagano, Jr. was supported by the Brazilian Government while pursuing his thesis research. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.",

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AU - Motta, A. T.

AU - Birtcher, R. C.

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PY - 1997/4/11

Y1 - 1997/4/11

N2 - We report here a study of Kr ion implantation and resultant bubble formation in Zr and Zr alloys, including Zircaloy-2 and Zircaloy-4. Implantations into thin foils were performed in-situ in the HVEM/Tandem facility at Argonne National Laboratory at temperatures between 300 to 800°C and to doses up to 2 X 1020 ion m-2. Bulk specimens were implanted in an ion-beam chamber and then thinned for viewing by TEM. In thin foils, only small bubbles (3-10 nm) were formed at all temperatures with the exception of the Cr-rich Valloy where 13 nm bubbles were formed. Bulk samples implanted at 300°C contained a bubble morphology similar to that observed after implantation into thin foils. However at high temperatures (500-800°C) large faceted bubbles (up to 30 nm) were produced in bulk specimens. The results indicate that bubble formation and evolution below 500°C is controlled by gas concentration, while it is controlled by bubble mobility at high temperatures.

AB - We report here a study of Kr ion implantation and resultant bubble formation in Zr and Zr alloys, including Zircaloy-2 and Zircaloy-4. Implantations into thin foils were performed in-situ in the HVEM/Tandem facility at Argonne National Laboratory at temperatures between 300 to 800°C and to doses up to 2 X 1020 ion m-2. Bulk specimens were implanted in an ion-beam chamber and then thinned for viewing by TEM. In thin foils, only small bubbles (3-10 nm) were formed at all temperatures with the exception of the Cr-rich Valloy where 13 nm bubbles were formed. Bulk samples implanted at 300°C contained a bubble morphology similar to that observed after implantation into thin foils. However at high temperatures (500-800°C) large faceted bubbles (up to 30 nm) were produced in bulk specimens. The results indicate that bubble formation and evolution below 500°C is controlled by gas concentration, while it is controlled by bubble mobility at high temperatures.

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The formation of bubbles in Zr alloys under Kr ion irradiation

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