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Microstructural effects on strain rate and dwell sensitivity in dual-phase titanium alloys

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Title: Microstructural effects on strain rate and dwell sensitivity in dual-phase titanium alloys
Authors: Waheed, S
Zheng, Z
Balint, D
Dunne, F
Item Type: Journal Article
Abstract: In this study, stress relaxation tests are performed to determine and compare the strain rate sensitivity of different titanium alloy microstructures using discrete dislocation plasticity (DDP) and crystal plasticity finite element (CPFE) simulations. The anisotropic α and β phase properties of alloy Ti-6242 are explicitly included in both the thermally-activated DDP and CPFE models together with direct dislocation penetration across material-interfaces in the DDP model. Equiaxed pure α, colony, Widmanstatten and basketweave microstructures are simulated together with an analysis of the effect of α grain size and dislocation penetration on rate sensitivity. It is demonstrated that alloy morphology and texture significantly influence microstructural material rate sensitivity in agreement with experimental evidence in the literature, whereas dislocation penetration is found not to be as significant as previously considered for small deformations. The mechanistic cause of these effects is argued to be changes in dislocation mean free path and the total propensity for plastic slip in the specimen. Comparing DDP results with corresponding CPFE simulations, it is shown that discrete aspects of slip and hardening mechanisms have to be accounted for to capture experimentally observed rate sensitivity. Finally, the dwell sensitivity in a polycrystalline dual-phase titanium alloy specimen is shown to be strongly dependent on its microstructure.
Issue Date: 1-Jan-2019
Date of Acceptance: 17-Sep-2018
URI: http://hdl.handle.net/10044/1/64954
DOI: https://dx.doi.org/10.1016/j.actamat.2018.09.035
ISSN: 1359-6454
Publisher: Elsevier
Start Page: 136
End Page: 148
Journal / Book Title: Acta Materialia
Volume: 162
Copyright Statement: © 2018 Acta Materialia Inc. 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)
Engineering & Physical Science Research Council (E
EPSRC
Royal Academy Of Engineering
Funder's Grant Number: EP/K034332/1
138874
EP/K034332/1
MMRE_P54661
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
Dwell fatigue
Discrete dislocation plasticity
Morphology
Texture
Dislocation penetration
Crystal plasticity
DISCRETE DISLOCATION PLASTICITY
ROOM-TEMPERATURE DEFORMATION
GRAIN-STRUCTURE GENERATION
CRYSTAL PLASTICITY
ALPHA-TITANIUM
CRYSTALLOGRAPHIC ORIENTATION
TI-6242 ALLOY
SLIP TRANSFER
FATIGUE
SINGLE
0912 Materials Engineering
0913 Mechanical Engineering
Materials
Publication Status: Published
Online Publication Date: 2018-09-20
Appears in Collections:Faculty of Engineering
Mechanical Engineering
Materials
Faculty of Natural Sciences



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