Expansion Mechanisms in Foaming Aluminum Melts
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- Song, Z. & Nutt, S. Metall and Mat Trans A (2008) 39: 2215. doi:10.1007/s11661-008-9573-7
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The expansion of molten aluminum foam was studied to determine flow mechanisms in the cellular melt. The structure of the foaming melt evolved through a series of deformation stages before the foam stabilized and solidified. Changes in cell geometry during foam expansion were observed at different positions within the mold cavity and analyzed to determine flow mechanisms. The deformation patterns and cell shapes during foam expansion were observed macroscopically and microscopically from metallographic sections. Simple mechanical models described the salient features and mechanisms of the expansion process.