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The role of β-titanium ligaments in the deformation of dual phase titanium alloys

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Title: The role of β-titanium ligaments in the deformation of dual phase titanium alloys
Authors: Jun, T-S
Maeder, X
Bhowmik, A
Guillonneau, G
Michler, J
Giuliani, F
Britton, TB
Item Type: Journal Article
Abstract: Multiphase titanium alloys are critical materials in high value engineering components, for instance in aero engines. Microstructural complexity is exploited through interface engineering during mechanical processing to realise significant improvements in fatigue and fracture resistance and strength. In this work, we explore the role of select interfaces using in-situ micromechanical testing with concurrent observations from high angular resolution electron backscatter diffraction (HR-EBSD). Our results are supported with post mortem transmission electron microscopy (TEM). Using micro-pillar compression, we performed in-depth analysis of the role of select {\beta}-titanium (body centred cubic) ligaments which separate neighbouring {\alpha}-titanium (hexagonal close packed) regions and inhibit the dislocation motion and impact strength during mechanical deformation. These results shed light on the strengthening mechanisms and those that can lead to strain localisation during fatigue and failure.
Issue Date: 11-Feb-2019
Date of Acceptance: 9-Jan-2019
URI: http://hdl.handle.net/10044/1/71391
DOI: https://dx.doi.org/10.1016/j.msea.2019.01.032
ISSN: 0921-5093
Publisher: Elsevier
Start Page: 394
End Page: 405
Journal / Book Title: Materials Science and Engineering: A
Volume: 746
Copyright Statement: © 2019 Elsevier B.V. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Royal Academy Of Engineering
Funder's Grant Number: EP/K034332/1
RF/129
Keywords: Science & Technology
Technology
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Science & Technology - Other Topics
Materials Science
Micropillar compression
Micromechanics
Electron backscatter diffraction (EBSD)
TEM
Titanium alloys
STRAIN-RATE SENSITIVITY
ROOM-TEMPERATURE DEFORMATION
CRYSTAL PLASTICITY
SLIP TRANSMISSION
ELASTIC STRAIN
DWELL FATIGUE
ALPHA-PHASE
DIFFRACTION
MICROSTRUCTURE
MECHANISMS
cond-mat.mtrl-sci
cond-mat.mtrl-sci
cond-mat.mtrl-sci
cond-mat.mtrl-sci
Materials
0912 Materials Engineering
0913 Mechanical Engineering
Notes: as submitted version
Publication Status: Published
Embargo Date: 2020-01-11
Online Publication Date: 2019-01-11
Appears in Collections:Faculty of Engineering
Materials
Faculty of Natural Sciences



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