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Evolution of dislocation patterns inside the plastic zone introduced by fatigue in an aged aluminium alloy AA2024-T3

Breitbarth, Eric and Zaefferer, Stefan and Archie, Fady and Besel, Michael and Raabe, Dierk and Requena, Guillermo (2018) Evolution of dislocation patterns inside the plastic zone introduced by fatigue in an aged aluminium alloy AA2024-T3. Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing. Elsevier. DOI: 10.1016/j.msea.2018.01.068 ISSN 0921-5093

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Official URL: https://www.sciencedirect.com/science/article/pii/S0921509318300972

Abstract

The formation of dislocations patterns within the plastic zone ahead of a crack tip introduced by fatigue loading in AA2024-T3 sheets is studied by electron channelling contrast imaging (ECCI) and electron backscatter diffraction (EBSD). The aim lies in correlating local plastic effects at grain level with digital image correlation (DIC) results obtained at coarser resolution. While dislocation patterns are observed already prior to fatigue loading, the presence of dislocation sources and dislocation entanglements increases towards highly deformed regions near the crack path. Also, deformation veins are revealed by EBSD in grains located along the crack path. Based on ECCI and EBSD the dislocation density was determined and shows a gradient towards the crack tip. The results help linking the process of fatigue deformation at grain-level to the deformation field probed at the mesoscale level.

Item URL in elib:https://elib.dlr.de/119169/
Document Type:Article
Title:Evolution of dislocation patterns inside the plastic zone introduced by fatigue in an aged aluminium alloy AA2024-T3
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Breitbarth, EricEric.Breitbarth (at) dlr.deUNSPECIFIED
Zaefferer, StefanMPIE, DüsseldorfUNSPECIFIED
Archie, FadyMPIE, DüsseldorfUNSPECIFIED
Besel, Michaelmichael.besel (at) dlr.deUNSPECIFIED
Raabe, DierkMPIE, DüsseldorfUNSPECIFIED
Requena, GuillermoGuillermo.Requena (at) dlr.deUNSPECIFIED
Date:March 2018
Journal or Publication Title:Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.msea.2018.01.068
Publisher:Elsevier
ISSN:0921-5093
Status:Published
Keywords:Fatigue cracks; Plastic zone; Dislocation patterns; Electron channelling contrast imaging
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials, L - Simulation and Validation
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Breitbarth, Eric
Deposited On:02 Mar 2018 12:30
Last Modified:06 Sep 2019 15:28

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