Abstract
In this study, we design ultralow density Mg−8.4Li (~ 1.46 g/cc), and Mg-9Li (~ 1.44 g/cc) alloys processed by Disintegrated Melt Deposition (DMD) having extraordinary properties outperforming the existing commercial magnesium (Mg) alloys in terms of specific strength, strain hardening ability and ductility. The developed alloys were characterized for microstructural, microhardness, compressive and damping properties. Unique image threshold technique coupled with SEM and EDS was used for better visualization of the phases and layers formed on the surface of Mg-Li binary alloys. The high reactivity of lithium (Li) with Mg resulted in evaporation and oxidation of alloying elements, thereby effectively reducing the wt.% of Li added to ~ 8.4 and 9 wt.% than the original amount of 15 and 20 wt.%, respectively. Microstructural analysis revealed presence of both α-Mg and β-Li solid solution phases in both Mg-8.4Li and Mg-9Li alloys. The materials presented impressive compressive and energy absorption properties, exhibiting > 80% fracture strain for both alloys, with Mg-8.4Li exhibiting the highest compressive yield strength (CYS) value of 192 MPa and Mg-9Li exhibiting the highest ultimate compressive strength (UCS) value of 2312 MPa. The overall damping properties were also enhanced for the binary Mg-Li alloys and showed the highest specific value as compared with other popular commercial magnesium, aluminum, titanium or ferrous alloys. Finally, microstructural changes in Mg owing to alloying with Li and its effect on the mechanical and damping properties are elaborately discussed.
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This work was supported by the Singapore Ministry of Education Academic Research Funding. The grant number is WBS# R-265-000-684-114.
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This invited article is part of a special topical focus in the Journal of Materials Engineering and Performance on Magnesium. The issue was organized by Prof. C. (Ravi) Ravindran, Dr. Raja Roy, Mr. Payam Emadi, and Mr. Bernoulli Andilab, Ryerson University.
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Mishra, S.K., Manakari, V., Parande, G. et al. Development of Ultralight Binary Mg-Li Alloys: Enhancing Damping, Ductility, and Ultimate Compressive Strength beyond 2000 MPa. J. of Materi Eng and Perform 32, 2723–2734 (2023). https://doi.org/10.1007/s11665-022-07335-w
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DOI: https://doi.org/10.1007/s11665-022-07335-w