Advanced

Investigation of faceted void morphologies in UO2 by phase field modelling

Zhu, Yaochan LU and Hallberg, Håkan LU (2015) In Journal of Nuclear Materials 467(Part 1). p.113-120
Abstract
In the present study a phase field model for high surface energy anisotropy is developed to model the morphologies of voids in UO2. In order to precisely account for the high anisotropy, an alternative forward-backward strategy based on a staggered grid with an averaged interface normal scheme is used in the numerical procedure. A variety of equilibrium void shapes are reproduced with respect to a constant volume condition. The facet areas and facet energies are calculated. The simulations show excellent agreement with the analytic predictions obtained through Wulff constructions. For the void shapes with high Miller index facets, it is discovered that a slight decrease in total surface area will result in a substantial increase in the... (More)
In the present study a phase field model for high surface energy anisotropy is developed to model the morphologies of voids in UO2. In order to precisely account for the high anisotropy, an alternative forward-backward strategy based on a staggered grid with an averaged interface normal scheme is used in the numerical procedure. A variety of equilibrium void shapes are reproduced with respect to a constant volume condition. The facet areas and facet energies are calculated. The simulations show excellent agreement with the analytic predictions obtained through Wulff constructions. For the void shapes with high Miller index facets, it is discovered that a slight decrease in total surface area will result in a substantial increase in the total surface energy. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Phase field UO2 Voids Anisotropy Surface energy
in
Journal of Nuclear Materials
volume
467
issue
Part 1
pages
113 - 120
publisher
Elsevier
external identifiers
  • wos:000365602800011
  • scopus:84942317274
ISSN
0022-3115
DOI
10.1016/j.jnucmat.2015.09.024
language
English
LU publication?
yes
id
a828bab7-d92b-4fa7-9e34-d80552bf0f32 (old id 7994661)
date added to LUP
2015-09-29 12:19:10
date last changed
2017-04-02 03:01:28
@article{a828bab7-d92b-4fa7-9e34-d80552bf0f32,
  abstract     = {In the present study a phase field model for high surface energy anisotropy is developed to model the morphologies of voids in UO2. In order to precisely account for the high anisotropy, an alternative forward-backward strategy based on a staggered grid with an averaged interface normal scheme is used in the numerical procedure. A variety of equilibrium void shapes are reproduced with respect to a constant volume condition. The facet areas and facet energies are calculated. The simulations show excellent agreement with the analytic predictions obtained through Wulff constructions. For the void shapes with high Miller index facets, it is discovered that a slight decrease in total surface area will result in a substantial increase in the total surface energy.},
  author       = {Zhu, Yaochan and Hallberg, Håkan},
  issn         = {0022-3115},
  keyword      = {Phase field UO2 Voids Anisotropy Surface energy},
  language     = {eng},
  number       = {Part 1},
  pages        = {113--120},
  publisher    = {Elsevier},
  series       = {Journal of Nuclear Materials},
  title        = {Investigation of faceted void morphologies in UO2 by phase field modelling},
  url          = {http://dx.doi.org/10.1016/j.jnucmat.2015.09.024},
  volume       = {467},
  year         = {2015},
}