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Open AccessArticle

Synthesis and Quasi-Static Compressive Properties of Mg-AZ91D-Al2O3 Syntactic Foams

Materials Science and Engineering Department, University of Wisconsin-Milwaukee, 3200 N. Cramer St., Milwaukee, WI 53211, USA
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Academic Editor: Sven De Schampheleire
Materials 2015, 8(9), 6085-6095; https://doi.org/10.3390/ma8095292
Received: 7 August 2015 / Revised: 28 August 2015 / Accepted: 3 September 2015 / Published: 11 September 2015
(This article belongs to the Special Issue Metal Foams: Synthesis, Characterization and Applications)
Magnesium alloys have considerably lower density than the aluminum alloy matrices that are typically used in syntactic foams, allowing for greater specific energy absorption. Despite the potential advantages, few studies have reported the properties of magnesium alloy matrix syntactic foams. In this work, Al2O3 hollow particles of three different size ranges, 0.106–0.212 mm, 0.212–0.425 mm, and 0.425–0.500 mm were encapsulated in Mg-AZ91D by a sub-atmospheric pressure infiltration technique. It is shown that the peak strength, plateau strength and toughness of the foam increases with increasing hollow sphere wall thickness to diameter (t/D) ratio. Since t/D was found to increase with decreasing hollow sphere diameter, the foams produced with smaller spheres showed improved performance—specifically, higher energy absorption per unit weight. These foams show better performance than other metallic foams on a specific property basis. View Full-Text
Keywords: syntactic foam; metal matrix composite; energy absorption; compressive properties syntactic foam; metal matrix composite; energy absorption; compressive properties
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Newsome, D.B.; Schultz, B.F.; Ferguson, J.B.; Rohatgi, P.K. Synthesis and Quasi-Static Compressive Properties of Mg-AZ91D-Al2O3 Syntactic Foams. Materials 2015, 8, 6085-6095.

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