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| Naji, M. |
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| Mohamed, Tarek |
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Grilo, José Luís Coelho Ferreira
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Publications (4/4 displayed)
- 2023Impact of the ultrasonic-assisted casting of an AlSi7Mg alloy on T6 heat treatmentcitations
- 2022The influence of precipitation hardening on the damping capacity in Al–Si–Mg cast components at different strain amplitudescitations
- 2021Manufacturing methodology on casting-based aluminium matrix composites: systematic reviewcitations
- 2019Ultrasonic Assisted Turning of Al alloys: Influence of Material Processing to Improve Surface Roughnesscitations
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article
The influence of precipitation hardening on the damping capacity in Al–Si–Mg cast components at different strain amplitudes
Abstract
An A356 alloy is a classic casting light alloy, which is able to be processed into complex geometrical shapes with tailored static and dynamic mechanical properties. As a promising material to reduce fuel and energy consumption in future vehicle designs, there is an interest in understanding the impact of heat treatments on the damping capacity of this alloy. The Granato–Lücke theory is used to detail the forced vibration response in gravity cast A356. It is shown that a solution treatment enhances damping capacity in lower stress states (i.e., strain-independent regime) due to the increase in weak pinning length. However, in high-stress states (i.e., strain-dependent regime), peak-aged (T6) samples display higher damping capacity. This is proposed to be originated by releasing dislocations from weak pinning points, which start bowing in the precipitates that act as strong pinning points. Based on these results, it is shown for the first time that the selection of heat treatments to optimize damping in forced vibration is highly dependent on the expected stress–strain state and must be considered in the design of cast components. ; This research was funded by PTDC/EMEEME/30967/2017 and NORTE-0145-FEDER-030967, co-financed by the European Regional Development Fund (ERDF) through the Operational Programme for Competitiveness and Internationalization (COMPETE 2020), under Portugal 2020, and by the Fundação para a Ciência e a Tecnologia—FCT I.P. national funds. Additionally, this work was supported by the Portuguese FCT, under the reference project UIDB/04436/2020. This work also acknowledges the financial support of the Portuguese Science Foundation for Science and Technology (FCT) under the projects UIDB/EMS/00481/2020 (TEMA) and CENTRO-01-0145-FEDER-022083 (Centro2020, PORTUGAL 2020, European Regional Development Fund). This work was financially supported by project PRIDOP (POCI-01-0247-FEDER-040271), co-financed by the European Community Fund FEDER through POCI—Programa Operacional Competitividade e ...