Discrete dislocation plasticity modeling of hydrides in zirconium under thermal cycling

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Title: Discrete dislocation plasticity modeling of hydrides in zirconium under thermal cycling
Authors: Patel, M
Waheed, S
Wenman, MR
Sutton, AP
Balint, DS
Item Type: Journal Article
Abstract: Understanding the ratcheting effect of hydrogen and hydride accumulation in response to thermal cycling is important in establishing a failure criterion for zirconium alloy nuclear fuel cladding. We propose a simple discrete dislocation plasticity model to study the evolution of the dislocation content that arises as a micro-hydride repeatedly precipitates and dissolves over a series of thermal cycles. With each progressive thermal cycle, we find a steady growth in the residual dislocation density in the vicinity of the hydride nucleation site; this corresponds to a gradual increase in the hydrogen concentration and, consequently, the hydride population. The simulated ratcheting in the dislocation density is consistent with experimental observations concerning the hysteresis in the terminal solid solubility of hydrogen in zirconium, which can be correlated to the plastic relaxation of hydrides.
Issue Date: 19-Jun-2017
Date of Acceptance: 13-Jun-2017
URI: http://hdl.handle.net/10044/1/49257
DOI: https://dx.doi.org/10.1557/adv.2017.452
ISSN: 2059-8521
Publisher: Cambridge University Press
Start Page: 3353
End Page: 3358
Journal / Book Title: MRS Advances
Volume: 2
Issue: 55
Copyright Statement: © Materials Research Society 2017. This paper has been accepted for publication and will appear in a revised form, subsequent to peer-review and/or editorial input by Cambridge University Press.
Sponsor/Funder: Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/L015579/1
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Materials Science
Publication Status: Published
Appears in Collections:Faculty of Engineering
Condensed Matter Theory
Mechanical Engineering
Materials
Physics
Faculty of Natural Sciences



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