Abstract
Aluminum foams with varying densities of 1.21-0.62 g/cm3 and pore sizes of 0.3-5.8 mm were successfully fabricated by friction stir processing (FSP) by varying the foaming temperature and fixing FSP parameters. Further, the combined effect of density and pore distribution on quasi-static compression deformation was investigated with a fixed strain rate of 0.001 s−1. Experiments have been done to establish a relationship between the stress–strain curve and the cell deformation mechanism. A separate compressive stress–strain curve is drawn to a minimum density of 0.62 g/cm3, while corresponding deformation points on the curve are analyzed by the SEM micrograph and related to identifying the cell failure mechanism. The EDS mapping was also done to illustrate the elemental Ti, O and Al distributions before and after compression. The compression testing identified four types of cell failure, including hinge formation, shearing, bending and crack initiation with tearing. Furthermore, the combined effect of density and pore size on different mechanical properties has been studied. Quasi-static compression studies confirm that with an increase in density and pore size, plateau stress and energy absorption also increased in the studied region. Energy absorption per unit volume was reported highest at a density of 1.21 g/cm3.
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Lohani, D., Daniel, B.S.S. Quasi-static Deformation Mechanism and Compressive Properties of Aluminum Foams Fabricated by Friction Stir Processing. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09508-1
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DOI: https://doi.org/10.1007/s11665-024-09508-1