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Dislocation modelling of the plastic relaxation and thermal ratchetting induced by zirconium hydride precipitation

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Title: Dislocation modelling of the plastic relaxation and thermal ratchetting induced by zirconium hydride precipitation
Authors: Reali, L
Balint, DS
Wenman, MR
Item Type: Journal Article
Abstract: The precipitation of hydrides in zirconium alloys is accompanied by a significant and anisotropic volumetric expansion. Previous literature quantified the misfit both theoretically and experimentally, but these values differ greatly; the experimental values are consistently lower. One possibility is that the experimental measurements include the effect of dislocations generated by the hydride, which relax the transformation stresses. To test this hypothesis, it is important to determine the stress field of a hydride and its associated dislocations, combined. A simple planar dislocation model was developed of the hydride—dislocation ensemble in -Zr. By capturing details of the dislocation structures given in the literature, it is shown in this study that including the interfacial dislocations largely reconciles the predicted and experimental values. Discrete dislocation plasticity is then used to model the diffuse plastic relaxation associated with hydride formation. The effects of plastic relaxation on the equilibrium hydrogen profile, hence the implications for subsequent hydride precipitation, are discussed. In particular, precipitation–dissolution cycles were simulated to calculate the magnitude of the residual hydrostatic tension, which is argued to be the primary cause of the “memory effect” for the re-precipitation of both and hydrides.
Issue Date: Oct-2022
Date of Acceptance: 13-Jun-2022
URI: http://hdl.handle.net/10044/1/97939
DOI: 10.1016/j.jmps.2022.104988
ISSN: 0022-5096
Publisher: Elsevier BV
Start Page: 104988
End Page: 104988
Journal / Book Title: Journal of the Mechanics and Physics of Solids
Volume: 167
Copyright Statement: © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: Engineering & Physical Science Research Council (E
Rolls-Royce Plc
Funder's Grant Number: PO 2073974
PO 6000-00210267
Keywords: Mechanical Engineering & Transports
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status: Published
Article Number: 104988
Appears in Collections:Materials

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