Reproducibility of Aluminum Foam by Combining Sintering and Dissolution Process with Precursor Foaming Process
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minum (Al) foam is lighter and has superior energy absorption properties to dense Al. Therefore, it is expected to be applied as shock absorbers in vehicles and trains.[1] However, when the Al foam absorbs impact energy, the pores collapse by folding of the cell walls, and the Al foam is densified. Even after the impact load is removed, Al foam cannot be restored to its initial shape. Therefore, the shock absorber components should be replaced after impact. If densified Al foam can be refoamed easily, it is expected that the Al foam can be reused. In this study, by combining a sintering and dissolution process[2] to fabricate the initial Al foam containing a blowing agent with a precursor foaming process[3] to refoam densified Al foam using the blowing agent contained in the initial Al foam, a preliminary study of the reproducibility of Al foam was performed. Scanning electron microscope (SEM) observation of the cell walls of the initial Al foam and X-ray diffraction (XRD) analysis of the densified Al foam were conducted to
YOSHIHIKO HANGAI, HAYATO MATSUSHITA, SHINJI KOYAMA, RYOSUKE SUZUKI, and MASAAKI MATSUBARA are with the Faculty of Science and Technology, Gunma University, Kiryu 376-8515, Japan. Contact e-mail: [email protected] Manuscript submitted January 15, 2017. Article published online April 24, 2017 METALLURGICAL AND MATERIALS TRANSACTIONS A
confirm that the blowing agent still exists before refoaming. In addition, X-ray computed tomography (CT) observation of the pore structures of refoamed Al foam was conducted. Figure 1 shows a schematic illustration of the processes used in this study. First, Al foam with blowing agent particles in the cell walls was fabricated by a sintering and dissolution process. As shown in Figure 1(a), Al-Si-Cu Al alloy ADC12 powder (equivalent to 383.0 Al alloy, sieved to
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