Date
2023-05-05Author
Sajadifar, Seyed VahidKrooß, PhilippKrochmal, MarcelWegener, ThomasHeidarzadeh, AkbarFröck, HannesZavašnik, JanezKessler, OlafNiendorf, ThomasSubject
600 Technology AluminiumlegierungMaterialermüdungMechanische EigenschaftGefüge <Werkstoffkunde>Metadata
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Artikel (Publikationen im Open Access gefördert durch die UB)
Low-Cycle-Fatigue Performance of Stress-Aged EN AW-7075 Alloy
Abstract
The effect of a novel heat treatment, that is, aging under superimposed external stress, on the fatigue performance and microstructural evolution of a high-strength aluminum alloy (EN AW-7075) is presented. Stress aging, a combination of heat treatment and superimposed external stress, can enhance the mechanical properties of EN AW-7075 under monotonic loading due to the acceleration of precipitation kinetics. Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) reveal that a longer aging time and the presence of superimposed stress both promote the formation and growth of precipitates, that is, the precipitation of strengthening η´ precipitates. This is confirmed by differential scanning calorimetry (DSC) heating experiments of stressless and stress-aged states. Furthermore, stress aging leads to a reduction of dimensions of precipitate-free zones near grain boundaries. Cyclic deformation responses (CDRs) and half-life hysteresis loops are evaluated focusing on the low-cycle fatigue (LCF) performance of different conditions. A noticeable cyclic hardening seen in case of the specimens aged for a short time indicates the occurrence of dynamic strain aging (DSA). Eventually, stress aging allows for an enhancement of the monotonic mechanical properties of EN AW-7075 without degrading the cyclic performance in the LCF regime.
Citation
In: Advanced Engineering Materials Volume 25 / Issue 15 (2023-05-05) eissn:1527-2648Sponsorship
Gefördert im Rahmen des Projekts DEALCollections
Publikationen (Fachgebiet Metallische Werkstoffe)Artikel (Publikationen im Open Access gefördert durch die UB)
Citation
@article{doi:10.17170/kobra-202402229625,
author={Sajadifar, Seyed Vahid and Krooß, Philipp and Krochmal, Marcel and Wegener, Thomas and Heidarzadeh, Akbar and Fröck, Hannes and Zavašnik, Janez and Kessler, Olaf and Niendorf, Thomas},
title={Low-Cycle-Fatigue Performance of Stress-Aged EN AW-7075 Alloy},
journal={Advanced Engineering Materials},
year={2023}
}
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2024-02-22T11:18:34Z 2024-02-22T11:18:34Z 2023-05-05 doi:10.17170/kobra-202402229625 http://hdl.handle.net/123456789/15479 Gefördert im Rahmen des Projekts DEAL eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ high-strength aluminum alloys low-cycle fatigue mechanical properties microstructures stress aging 600 Low-Cycle-Fatigue Performance of Stress-Aged EN AW-7075 Alloy Aufsatz The effect of a novel heat treatment, that is, aging under superimposed external stress, on the fatigue performance and microstructural evolution of a high-strength aluminum alloy (EN AW-7075) is presented. Stress aging, a combination of heat treatment and superimposed external stress, can enhance the mechanical properties of EN AW-7075 under monotonic loading due to the acceleration of precipitation kinetics. Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) reveal that a longer aging time and the presence of superimposed stress both promote the formation and growth of precipitates, that is, the precipitation of strengthening η´ precipitates. This is confirmed by differential scanning calorimetry (DSC) heating experiments of stressless and stress-aged states. Furthermore, stress aging leads to a reduction of dimensions of precipitate-free zones near grain boundaries. Cyclic deformation responses (CDRs) and half-life hysteresis loops are evaluated focusing on the low-cycle fatigue (LCF) performance of different conditions. A noticeable cyclic hardening seen in case of the specimens aged for a short time indicates the occurrence of dynamic strain aging (DSA). Eventually, stress aging allows for an enhancement of the monotonic mechanical properties of EN AW-7075 without degrading the cyclic performance in the LCF regime. open access Sajadifar, Seyed Vahid Krooß, Philipp Krochmal, Marcel Wegener, Thomas Heidarzadeh, Akbar Fröck, Hannes Zavašnik, Janez Kessler, Olaf Niendorf, Thomas 13 Seiten doi:10.1002/adem.202300090 Aluminiumlegierung Materialermüdung Mechanische Eigenschaft Gefüge <Werkstoffkunde> publishedVersion eissn:1527-2648 Issue 15 Advanced Engineering Materials Volume 25 false 2300090
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