Hostname: page-component-586b7cd67f-g8jcs Total loading time: 0 Render date: 2024-11-30T23:52:53.535Z Has data issue: false hasContentIssue false
  • English
  • Français

The Effect of Grain Boundaries and Second-Phase Particles on Hydride Precipitation in Zirconium Alloys

Published online by Cambridge University Press:  28 January 2018

Said El Chamaa ,
Mitesh Patel ,
Catrin M. Davies  and
Mark R. Wenman
Said El Chamaa*
Affiliation:
Department of Materials and Centre for Nuclear Engineering, Imperial College London, SW7 2AZ
Mitesh Patel
Affiliation:
Department of Physics, Imperial College London, SW7 2AZ, UK
Catrin M. Davies
Affiliation:
Department of Mechanical Engineering, Imperial College London, SW7 2AZ, UK
Mark R. Wenman
Affiliation:
Department of Materials and Centre for Nuclear Engineering, Imperial College London, SW7 2AZ
*
*(Email: [email protected])
Get access

Abstract

Understanding the precipitation of brittle hydride phases is crucial in establishing a failure criterion for various zirconium alloy nuclear fuel cladding. Accordingly, it is important to quantify the sensitivity of hydride precipitation to the component microstructure. This experimental investigation focuses on two microstructural characteristics and their role as hydride nucleation sites: The grain size and the alloy chemical composition. Samples of commercially pure zirconium (Zr-702) and Zircaloy-4, each with a wide range of grain sizes, were hydrided to 100 ppm and micrographs of the hydride distribution were optically analyzed for inter-granular and intra-granular precipitate sites. For most grain sizes, it was found that a significantly lower fraction of the precipitated hydrides nucleated at grain boundaries in Zircaloy-4 than in Zr-702, suggesting that a higher SPP content encourages the formation of intra-granular hydrides. Moreover, this effect became more prominent as the grain size increased; large-grain specimens contained a higher fraction of intra-granular hydrides than small-grain specimens of both Zr-702 and Zircaloy-4, highlighting the potency of grain boundaries as nucleation sites and how SPPs can influence the hydride distribution profile.

Keywords

ZrHsecond phases
Type
Articles
Information
MRS Advances , Volume 3 , Issue 31: Energy and Sustainability , 2018 , pp. 1749 - 1754
Check for updates
Copyright
Copyright © Materials Research Society 2018 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Puls, M.P., The Effect of Hydrogen and Hydrides on the Integrity of Zirconium Alloy Components: Delayed Hydride Cracking, 1st ed. (Springer, London, 2012) p. 7–336.Google Scholar
Northwood, D., Mater. Des. 6(2) 58–56 (1985).Google Scholar
Gros, J. and Wadier, J., J. Nucl. Mater. 172(1) 85–96 (1990).Google Scholar
Kearns, J. Nucl. Mater. 22(3) 292–303 (1967).Google Scholar
Patel, M., Waheed, S., Wenman, M.R., Sutton, A.P. and Balint, D.S., MRS Advances 2 (55) 3353–3358 (2017).CrossRefGoogle Scholar
Shi, S., Shek, G. and Puls, M.P., J. Nucl. Mater. 218(2) 189–201 (1995).Google Scholar
ASTM International in Standard Test Method for Determination of Hydrogen in Titanium and Titanium Alloys by Inert Gas Fusion Thermal Conductivity/Infrared Detection Method (ASTM E1447, 2009).Google Scholar
Tong, V. and Britton, T.. Acta Mater. 129 510–520 (2017).CrossRefGoogle Scholar
Bramwell, L., Haste, J., Worswick, D. and Parsons, D. in An Experimental Investigation into the Oxidation of Zircaloy-4 at Elevated Pressures in the 750 to 1000°C Temperature Range (Zirconium in the Nuclear Industry: Tenth International Symposium, ASTM STP 1245, 1994).Google Scholar
Weekes, H., Jones, N., Lindley, T. and Dye, D., J. Nucl. Mater. 478 32–41 (2016).Google Scholar
Westlake, D., J. Nucl. Mater. 16 215–219 (1965).Google Scholar
Ells, C., J. Nucl. Mater. 28(2) 129–151 (1968).Google Scholar
Christian, J.W., The Theory of Transformations in Metals and Alloys, 3rd ed. (Pergamon, Amsterdam, 2002) p. 356.Google Scholar