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Improved Stability of Aluminum Foam Through Heat Treatment of Foamable Precursor
Fan Deng,Yanqiang Liu,Xuehan Lu,Jianzhong Fan 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
Foam stability, characterized by the dynamics of foam expansion and decay, is essential for producing aluminum foam. While, the stability is often difficult to control. In present study, the heat treatment of foamable precursor was applied toimprove the foam stability via the powder route. Interestingly, both process of foam expansion and decay were remarkablyslow down after heat treatment. The time to achieve peak expansion was prolonged to 2.38 times, and the time span frompeak expansion to obvious drainage and collapse happening increased to 6 times. The enhanced stability is thought to relateto the oxide-flakes on the cell face caused by heat treatment.
Effect of Cu on Pore Structure of Al–Si Foam
Fan Deng,Jianzhong Fan,Yanqiang Liu,Xuehan Lu,Shaohua Wei,Junhui Nie 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
The alloy composition is an important factor effecting the pore structure of aluminum foam. In this paper, the powder compactfoaming method was used, and different content of Cu element powders were added to the alloy Al–9Si, for investigatingthe effect of alloying element on foaming process. With the Cu content of Al–Si–Cu alloy increasing, the expansion ratio isincreased, the time required to reach maximum expansion is shortened, and the number of fissure-like pores at early foamingstage is decreased. This improving action is related to the higher volume fraction of liquid phase in same melting temperaturecaused by increasing Cu content in alloy. Comparing different Al–Si–Cu alloys with different Cu content at same expansionratio, the higher Cu content, the smaller pore size and the thinner cell wall. This beneficial effect on pore structure is attributedto the addition of Cu that is benefit to increasing the viscosity of Al–Si–Cu alloy during foaming. And at same expansionrate, the more content of Cu in Al–Si–Cu alloy, the higher compressive strength of aluminum foam.