Crystallography and elastic anisotropy in fatigue crack nucleation at nickel alloy twin boundaries
Author(s)
Zhang, Xiaoxian
Stinville, Jean-Charles
Pollock, Tresa M
Dunne, Fionn PE
Type
Journal Article
Abstract
Fatigue crack nucleation at annealing twin boundaries (TBs) within polycrystal nickel-based superalloy Ren´e 88DT is investigated with a
microstructure-sensitive crystal plasticity (CP) model, digital image correlation strain measurements and experimental SEM crack nucleation observations. Strong slip localizations at TBs were experimentally observed and predicted by the CP model, which also showed high predicted
geometrically necessary dislocation and corresponding stored energy densities, capturing experimental observations of crack nucleation. In a
systematic study, elastic anisotropy was found to drive local elastic constraint and hence resolved shear stress, slip activation, GND density and
stored energy density, demonstrating for this reason that TBs are preferential sites for crack nucleation in this alloy. The parent grain / twin pair
crystallographic orientation with respect to remote loading was also demonstrated to be key to slip activation parallel to TBs and hence to stored
energy density and fatigue crack nucleation, and the range of most damaging parent grain orientations has been identified.
microstructure-sensitive crystal plasticity (CP) model, digital image correlation strain measurements and experimental SEM crack nucleation observations. Strong slip localizations at TBs were experimentally observed and predicted by the CP model, which also showed high predicted
geometrically necessary dislocation and corresponding stored energy densities, capturing experimental observations of crack nucleation. In a
systematic study, elastic anisotropy was found to drive local elastic constraint and hence resolved shear stress, slip activation, GND density and
stored energy density, demonstrating for this reason that TBs are preferential sites for crack nucleation in this alloy. The parent grain / twin pair
crystallographic orientation with respect to remote loading was also demonstrated to be key to slip activation parallel to TBs and hence to stored
energy density and fatigue crack nucleation, and the range of most damaging parent grain orientations has been identified.
Date Issued
2021-10
Date Acceptance
2021-06-16
Citation
Journal of the Mechanics and Physics of Solids, 2021, 155
ISSN
0022-5096
Publisher
Elsevier
Journal / Book Title
Journal of the Mechanics and Physics of Solids
Volume
155
Copyright Statement
Copyright © Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
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Subjects
AUSTENITIC STAINLESS-STEEL
CRYSTAL PLASTICITY
DEFORMATION
ENERGY DENSITY
INITIATION
Materials Science
Materials Science, Multidisciplinary
Mechanics
MODEL
PERSISTENT SLIP BANDS
Physical Sciences
Physics
Physics, Condensed Matter
POLYCRYSTALLINE MATERIALS
SCALE
Science & Technology
STRAIN LOCALIZATION
Technology
Publication Status
Published
Article Number
104538
Date Publish Online
2021-06-26