Abstract
7075 Al–SiO2 composite foams were prepared by direct melt foaming method. The microstructures of the composite foams showed uniformly distributed particles in the composite foams. Aging studies showed that the hardness values of as-quenched composite foams were higher than that of 7075 Al foam and all the foam samples revealed two clear aging peaks. The aging behavior of the 7075 Al foam was different in kinetic and magnitude from of the 7075 Al–SiO2 composites, where the levels of peak hardness attained in the two peaks of 7075 Al foam were higher than those of the composite foams. Also, the aging times to attain the two peaks of the 7075 Al foam were shorter than those of the composite foams. DTA analyses indicated that the precipitation sequences of the composite foams were similar to that of the 7075 Al foam. However, the precipitation peaks of the composite foams were shifted to higher temperatures and the sizes of the hardening precipitate formation peaks in the composite foams were decreased, indicating that the formation of hardening precipitate zones was suppressed by the incorporation of the SiO2 particles or increasing the content of the foaming agent. The CTE of the 7075 Al foam was higher than that of the 7075 Al–15 vol % SiO2 composite foam.
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This project was supported financially by the Science and Technology Development Fund (STDF), Egypt, Grant no. 25243.
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Daoud, A., Abou El-Khair, M.T., Fairouz, F. et al. Microstructures, Aging Behavior and Thermal Expansion of 7075 Al–Silica Particle Waste Composite Foams Produced with Recycled Aluminum Cans. Phys. Metals Metallogr. 121, 1358–1363 (2020). https://doi.org/10.1134/S0031918X20130049
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DOI: https://doi.org/10.1134/S0031918X20130049