Hydrogen accommodation in Zr second phase particles:Implications for H pick-up and hydriding of Zircaloy-2 and Zircaloy-4

Burr, P. A. and Murphy, S. T. and Lumley, S. C. and Wenman, M. R. and Grimes, R. W. (2013) Hydrogen accommodation in Zr second phase particles:Implications for H pick-up and hydriding of Zircaloy-2 and Zircaloy-4. Corrosion Science, 69. pp. 1-4. ISSN 0010-938X

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Abstract

Ab-initio computer simulations have been used to predict the energies associated with the accommodation of H atoms at interstitial sites in alpha,beta-Zr and Zr-M intermetallics formed with common alloying additions (M = Cr, Fe, Ni). Intermetallics that relate to the Zr-2(Ni,Fe) second phase particles (SPPs) found in Zircaloy-2 exhibit favourable solution enthalpies for H. The intermetallic phases that relate to the Zr(Cr,Fe)(2) SPPs, found predominantly in Zircaloy-4, do not offer favourable sites for interstitial H. It is proposed that Zr(Cr,Fe)(2) particles may act as bridges for the migration of H through the oxide layer, whilst the Zr-2(Ni,Fe)-type particles will trap the migrating H until these are dissolved or fully oxidised. (C) 2012 Elsevier Ltd. All rights reserved.

Item Type:
Journal Article
Journal or Publication Title:
Corrosion Science
Subjects:
ID Code:
125451
Deposited By:
Deposited On:
24 May 2018 12:40
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Nov 2020 05:51