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Ductile damage of AA2024-T3 under shear loading: Mechanism analysis through in-situ laminography

Tancogne-Dejean, Thomas; Roth, Christian C.; Morgeneyer, Thilo F.; Helfen, Lukas; Mohr, Dirk

Abstract:
The mechanisms leading to fracture of aluminum alloy AA2024-T3 under shear loading are investigated via X-ray synchrotron laminography. A 1mm-thick flat double-gage section shear specimen is loaded inside a synchrotron X-ray beamline. The microscale defects population is reconstructed on six loading steps as well as on the broken specimen. The material exhibits an initial void volume fraction of 0.7% as well as a high concentration of large Cu-rich intermetallic particles. Using 2D Digital Image Correlation of projected volume data, based on the void contrast, it is possible to track the evolution of both types of mesoscale defects throughout the loading and to correlate the deformation mechanisms with the local strains. Upon mechanical loading, pre-existing voids rotate and elongate following the deformation of the aluminum matrix. The intermetallic particles fail at early loading stages in a brittle manner, leading to the nucleation of voids normal to the maximum principal stress direction. The newly-created voids continue to grow during the subsequent loading steps impeded by the fragmented particles, eventually forming micro-cracks. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000131007
Veröffentlicht am 29.03.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 15.02.2021
Sprache Englisch
Identifikator ISSN: 1359-6454
KITopen-ID: 1000131007
HGF-Programm 56.03.10 (POF IV, LK 01) Material a. Processes f. Energy Technol.
Erschienen in Acta materialia
Verlag Elsevier
Band 205
Seiten Art.-Nr. 116556
Nachgewiesen in Scopus
Web of Science
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