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Closed-cell Al alloy composite foams: Production and characterization
Highlights ► Foamy Al–SiCp was manufactured by direct addition of CaCO3 into the molten Al alloy. ► Compressive and bending strengths of the foams increased with their density. ► Energy absorption ability of closed-cell foams improved with their density. ► Plastic collapse strength of the closed-cell foams were improved with their density.
Abstract Foamy Al alloy SiCp composites of different densities ranging from 0.4 to 0.7g/cm3 were manufactured by melt-foaming process, which consisted of direct CaCO3 addition into the molten A356 aluminum bath. Mechanical properties and morphological observations indicated that the three-stage deformation mechanism of typical cellular foams is dominant in the produced A356 aluminum foams. Middle-stage stress plateau shrinkage plus compressive strength and bending stress enhancements were observed in denser foams. With the same Al/SiCp ratio, energy absorption ability and plastic collapse strength of the closed-cell foams were increased with the foam density. Doubling cell-face bending effects resulted in larger compressive than bending strengths in the closed-cell foams; while stiffness lowering was due to the cell-face stretching conditions.
Closed-cell Al alloy composite foams: Production and characterization
Highlights ► Foamy Al–SiCp was manufactured by direct addition of CaCO3 into the molten Al alloy. ► Compressive and bending strengths of the foams increased with their density. ► Energy absorption ability of closed-cell foams improved with their density. ► Plastic collapse strength of the closed-cell foams were improved with their density.
Abstract Foamy Al alloy SiCp composites of different densities ranging from 0.4 to 0.7g/cm3 were manufactured by melt-foaming process, which consisted of direct CaCO3 addition into the molten A356 aluminum bath. Mechanical properties and morphological observations indicated that the three-stage deformation mechanism of typical cellular foams is dominant in the produced A356 aluminum foams. Middle-stage stress plateau shrinkage plus compressive strength and bending stress enhancements were observed in denser foams. With the same Al/SiCp ratio, energy absorption ability and plastic collapse strength of the closed-cell foams were increased with the foam density. Doubling cell-face bending effects resulted in larger compressive than bending strengths in the closed-cell foams; while stiffness lowering was due to the cell-face stretching conditions.
Closed-cell Al alloy composite foams: Production and characterization
Malekjafarian, M. (author) / Sadrnezhaad, S.K. (author)
2012-05-21
5 pages
Article (Journal)
Electronic Resource
English
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