Short crack propagation near coherent twin boundaries in nickel-based superalloy
File(s)
Published version
Author(s)
Zhang, Xiaoxian
Dunne, Fionn PE
Type
Journal Article
Abstract
Short crack propagation near a coherent twin boundary in polycrystal nickel alloy is investigated with 3D crystal plasticity extended finite element modelling (CP-XFEM), utilising reconstructed experimentally characterised microstructures and crack path observations. Short 3D cracks at coherent twin boundaries are shown to grow on parallel (1 1 1) slip planes at very high rate so as to be an intrinsic part of the nucleation process. This is found to occur predominantly because of the stress states established by twin/parent constraint driven by the local elastic anisotropy. If elastic isotropy is modelled, crack growth is found to be non-planar and inclined to the twin boundary. The twin/parent twist angle is also found to influence local stress state, such that the actual 60° twist angle gives rise to the highest local stresses, preferential crack nucleation and rapid growth parallel to the twin boundary, and the deviations from 60° change the crack morphology and rate of growth.
Date Issued
2023-07
Date Acceptance
2023-02-17
Citation
International Journal of Fatigue, 2023, 172
ISSN
0142-1123
Publisher
Elsevier
Journal / Book Title
International Journal of Fatigue
Volume
172
Copyright Statement
© 2023 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/bync-nd/4.0/).
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000967055200001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
CRITERION
CRYSTAL PLASTICITY
DEFORMATION
ENERGY DENSITY
Engineering
Engineering, Mechanical
GROWTH
HIGH-CYCLE FATIGUE
INITIATION
Materials Science
Materials Science, Multidisciplinary
MODEL
NUCLEATION
Science & Technology
STRAIN LOCALIZATION
Technology
Publication Status
Published
Article Number
107586
Date Publish Online
2023-02-18