Improvement of aluminium foaming by powder consolidation under vacuum
Scripta Materialia, 2009•Elsevier
Foamable AlSi11 precursors were uniaxially hot-compacted under vacuum and air and then
foamed. We studied the influence of the compaction atmosphere on the foaming behaviour
in situ by X-ray radioscopy. In vacuum-pressed precursors the growth of elongated bubbles
was reduced, resulting in a larger expansion and more reproducible foaming due to
improved consolidation. As a consequence, foams made from these precursors show a
more regular pore size distribution than foams made from traditionally pressed precursors.
foamed. We studied the influence of the compaction atmosphere on the foaming behaviour
in situ by X-ray radioscopy. In vacuum-pressed precursors the growth of elongated bubbles
was reduced, resulting in a larger expansion and more reproducible foaming due to
improved consolidation. As a consequence, foams made from these precursors show a
more regular pore size distribution than foams made from traditionally pressed precursors.
Foamable AlSi11 precursors were uniaxially hot-compacted under vacuum and air and then foamed. We studied the influence of the compaction atmosphere on the foaming behaviour in situ by X-ray radioscopy. In vacuum-pressed precursors the growth of elongated bubbles was reduced, resulting in a larger expansion and more reproducible foaming due to improved consolidation. As a consequence, foams made from these precursors show a more regular pore size distribution than foams made from traditionally pressed precursors.
Elsevier
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