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Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

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Abstract

Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (δ-ZrH1.66) at a hydrogen pressure of 20 atm was found following the {111} δ-ZrH1.66//(0001) α-Zr with the surrounding α-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normal-transverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/corner of the sample were observed. The causes for the localized hydride accumulation were also discussed.

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Acknowledgments

The authors wish to thank Mr. Joel Davis from the Australian Nuclear Science and Technology Organisation (ANSTO) for his technical assistance with the EBSD experiment. One of the authors (Zhiyang Wang) gratefully appreciates the financial support from the China Scholarship Council (CSC) and ANSTO.

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Authors and Affiliations

  1. Faculty of Engineering, University of Wollongong, Northfields Avenue, Wollongong, NSW, 2522, Australia

    Zhiyang Wang (Ph.D. Candidate) & Huijun Li (Associate Professor)

  2. The Bragg Institute, Australian Nuclear Science and Technology Organisation (ANSTO), New Illawarra Road, Lucas Heights, NSW, 2234, Australia

    Zhiyang Wang (Ph.D. Candidate) & Ulf Garbe (Instrument Scientist)

  3. The Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, New Illawarra Road, Lucas Heights, NSW, 2234, Australia

    Robert P. Harrison (Program Leader)

  4. Paul Scherrer Institut (PSI), 5232, Villigen PSI, Switzerland

    Anders Kaestner (Beamline Scientist) & Eberhard Lehmann (Group Leader)

Authors
  1. Zhiyang Wang
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  2. Ulf Garbe
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  3. Huijun Li
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  4. Robert P. Harrison
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  5. Anders Kaestner
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  6. Eberhard Lehmann
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Correspondence to Zhiyang Wang.

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Manuscript submitted January 17, 2013.

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Wang, Z., Garbe, U., Li, H. et al. Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4. Metall Mater Trans B 45, 532–539 (2014). https://doi.org/10.1007/s11663-013-9866-0

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  • DOI: https://doi.org/10.1007/s11663-013-9866-0

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