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Slip transfer and deformation structures resulting from the low cycle fatigue of near-alpha titanium alloy Ti-6242Si

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Title: Slip transfer and deformation structures resulting from the low cycle fatigue of near-alpha titanium alloy Ti-6242Si
Authors: Joseph, S
Bantounas
Lindley
Dye, D
Item Type: Journal Article
Abstract: Near-alpha titanium alloy Ti6242Si, widely used in aero-engine compressor discs, was subjected to low cycle fatigue loading at room temperature. Fracture initiated by facet formation, followed by striated fatigue crack growth prior to final failure. Deformation occurred primarily by planar slip, localized into slip bands in the primary alpha. Within soft-oriented grains in a microtextured region, pile-up of a slip band within one grain resulted in the direct transfer of slip into an adjacent similarly oriented grain. In contrast, pile up of dislocations in a soft grain with a ‘hard’ oriented neighbour resulted in the activation of few non-connected dislocations in the hard grain, with <a>-type dislocations being activated and the observation of cross-slip. Whilst a high density of dislocations was present from precipitation of secondary alpha in the retained beta ligaments, a little dislocation interaction was observed between the transformed beta and the primary alpha grains.
Issue Date: 1-Jan-2018
Date of Acceptance: 20-Sep-2017
URI: http://hdl.handle.net/10044/1/51229
DOI: 10.1016/j.ijplas.2017.09.012
ISSN: 0749-6419
Publisher: Elsevier
Start Page: 90
End Page: 103
Journal / Book Title: International Journal of Plasticity
Volume: 100
Issue: 1
Copyright Statement: © 2017 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
Transmission electron microscopy
Slip transmission
Fatigue
Dislocations
DWELL-SENSITIVE FATIGUE
GRAIN-BOUNDARY INTERACTIONS
CRYSTAL PLASTICITY
CRYSTALLOGRAPHIC ORIENTATION
FRACTURE FACETS
CRACK-GROWTH
MICROSTRUCTURE
DISLOCATION
MODEL
NUCLEATION
Mechanical Engineering & Transports
0905 Civil Engineering
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Online Publication Date: 2017-09-27
Appears in Collections:Materials
Faculty of Natural Sciences
Faculty of Engineering