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Metals 2017, 7(8), 298;

Coalescence Avalanches in Liquid Aluminum Foams

Institute of Applied Materials, Energy Materials, Helmholtz Center Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
Structure and Properties of Materials, Institute of Materials Science and Technology, Technical University Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
X-ray Imaging Group ID-19, European Synchrotron Radiation Facility—ESRF, 71 Avenue de Martyrs, 38000 Grenoble, France
Author to whom correspondence should be addressed.
Received: 14 July 2017 / Revised: 28 July 2017 / Accepted: 1 August 2017 / Published: 4 August 2017
(This article belongs to the Special Issue Porous Metals and Metallic Foams)
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Coalescence is the rupture of a film between two adjacent bubbles in any type of liquid foam and has pronounced influence on the development of its macrostructure after solidification, mostly leading to larger pores and a wider size distribution. Foamable AlSi6Cu4 + 0.5 wt % TiH2 precursors made following the powder metallurgical route were foamed in a gas-tight X-ray transparent furnace under 500 kPa (5 bar) pressure with subsequent pressure release. Coalescence was investigated by fast X-ray radioscopy at a frame rate of 1250 Hz and an effective pixel size of 9 µm at the beamline ID-19, European Synchrotron Radiation Facility (ESRF), Grenoble, France. A self-developed program yielded the temporal and spatial detection of coalescence events in the acquired radioscopies. We observed the occurrence of film ruptures in a short temporal and spatial distance and we will refer to these phenomena as “avalanches”. View Full-Text
Keywords: coalescence; avalanches; cascades; metal foam; film rupture; bubbles coalescence; avalanches; cascades; metal foam; film rupture; bubbles

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Paeplow, M.; García-Moreno, F.; Meagher, A.J.; Rack, A.; Banhart, J. Coalescence Avalanches in Liquid Aluminum Foams. Metals 2017, 7, 298.

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