Abstract
Semi-solid route is a fabrication method of aluminum foam where the melt is thickened by primary crystals. In this study, semi-solid aluminum alloy films were made to observe and evaluate the stabilization mechanism of cell walls in Semi-solid route. Each film was held at different solid fractions and holding times. In lower solid fractions, as the holding time increases, the remaining melt in the films lessens and this could be explained by Poiseuille flow. However, the decreasing tendency of the remaining melt in the films lessens as the solid fraction increases. Moreover, when the solid fraction is high, decreasing tendency was not observed. These are because at a certain moment, clogging of primary crystals occurs under the thinnest part of the film and drainage is largely suppressed. Moreover, clogging is occurring in solid fraction of 20–45% under the thinnest part of the film. Moreover, the time to occur clogging becomes earlier as the solid fraction increases.
Highlights
Recent days, improved fuel consumption is required for transportation equipment such as automobiles
Since the phase diagram of Al-Si is simple and primary crystals of hypoeutectic alloy are easy to observe, this material is suitable for evaluation
Compositions of study the pure andSince the Al-25mass%Si ingots used is in this simple and primary crystals of hypoeutectic alloy are easy to observe, this material is suitable for study are shown in Tables 1 and 2, respectively
Summary
Recent days, improved fuel consumption is required for transportation equipment such as automobiles. Passenger safety including the crash safety must be maintained. For this purpose, aluminum foams with many pores dispersed inside are actively investigated. Aluminum foams with many pores dispersed inside are actively investigated They are ultralight materials and exhibit shock absorbing characteristics called plateau phenomenon when compressed. It is expected to be applied for transportation equipment [2] They have excellent property in sound insulation equivalent to glass wool [3,4]. They have heat insulation properties [5]
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