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Viewing the early stage of metal foam formation by computed tomography using synchrotron radiation

: Helfen, L.; Baumbach, T.; Stanzick, H.; Banhart, J.; Elmoutaouakkil, A.; Cloetens, P.


Advanced engineering materials 4 (2002), Nr.10, S.808-813
ISSN: 1438-1656
ISSN: 1615-7508
Fraunhofer IZFP ()
Fraunhofer IFAM ()
foam structure; synchrotron radiation; computed tomography

Foamed aluminium alloy containing 7wt.-% of Si is investigated by µm-resolved X-ray computed tomography (CT) using synchrotron radiation. The foam is fabricated employing a Powder metallurgical route. The evolution of foam microstructure is characterized by studying a series of samples representing different stages of foam expansion obtained by interrupting the foaming process for each sample at different foaming times. The computer tomographic reconstruction provides a 3D image of the pore structure as well as the spatial distribution of the blowing agent and of the pores at different foaming stages.