MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Fracture Behavior of Metal Foam Made of Recycled MMC by the Melt Route
Emiel AmsterdamNorbert BabcsánJeff T. M. De HossonPatrick R. OnckJohn Banhart
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2006 Volume 47 Issue 9 Pages 2219-2222

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Abstract

Metal foam was made from recycled MMC precursor by the melt route. The original starting material was an Al-9Si alloy containing 20 vol% of SiC particles (10 μm), which are used to stabilize the foam during the foaming process. The starting material has been used to make foam parts from which the residue was recycled and refoamed. During the (re)foaming process Fe is present in the melt. During solidification of the foam, β-AlSiFe plates are formed with the surplus of Si and Al present in the alloy. These plates run through the entire thickness of the cell wall (40–50 μm) and their length ranges between 50 and 200 μm. During in-situ tensile tests fracture initiates in the β-AlFeSi plates and propagates through other β-AlFeSi plates leading to brittle fracture of the cell walls.

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© 2006 The Japan Institute of Metals and Materials
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