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Dislocation interactions and crack nucleation in a fatigued near-alpha titanium alloy

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Title: Dislocation interactions and crack nucleation in a fatigued near-alpha titanium alloy
Authors: Joseph, S
Lindley, T
Dye, D
Item Type: Journal Article
Abstract: Dislocation interactions at the crack nucleation site were investigated in near-alpha titanium alloy Ti-6242Si subjected to low cycle fatigue. Cyclic plastic strain in the alloy resulted in dislocation pile-ups in the primary alpha grains, nucleated at the boundaries between the primary alpha and the two-phase regions. These two phase regions provided a barrier to slip transfer between primary alpha grains. We suggest that crack nucleation occurred near the basal plane of primary alpha grains by the subsurface double-ended pile-up mechanism first conceived by Tanaka and Mura. Superjogs on the basal dislocations were observed near the crack nucleation location. The two phase regions showed direct transmission of dislocations between secondary alpha plates, transmitted through the beta ligaments as , which then decompose into dislocation networks in the beta. The beta ligaments themselves do not appear to form an especially impenetrable barrier to slip, in agreement with the micropillar and crystal plasticity investigations of Zhang et al.
Issue Date: 1-Nov-2018
Date of Acceptance: 16-Jun-2018
URI: http://hdl.handle.net/10044/1/61553
DOI: https://dx.doi.org/10.1016/j.ijplas.2018.06.009
ISSN: 0749-6419
Publisher: Elsevier
Start Page: 38
End Page: 56
Journal / Book Title: International Journal of Plasticity
Volume: 110
Copyright Statement: © 2018 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 (EPSRC)
Funder's Grant Number: EP/K034332/1
Keywords: Science & Technology
Technology
Engineering, Mechanical
Materials Science, Multidisciplinary
Mechanics
Engineering
Materials Science
Titanium alloys
Dislocations
TEM
Fatigue
COPPER SINGLE-CRYSTALS
ROOM-TEMPERATURE DEFORMATION
CYCLIC DEFORMATION
TI ALLOY
SLIP BANDS
BEHAVIOR
INITIATION
MODEL
MICROSTRUCTURE
MECHANISMS
cond-mat.mtrl-sci
cond-mat.mtrl-sci
Mechanical Engineering & Transports
0905 Civil Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Online Publication Date: 2018-06-20
Appears in Collections:Materials
Faculty of Natural Sciences
Faculty of Engineering