Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9796641 | Materials Science and Engineering: A | 2005 | 10 Pages |
Abstract
Syntactic foams were fabricated by liquid metal infiltration of commercially pure and 7075 aluminum into preforms of hollow ceramic microspheres. The foams exhibited peak strengths during quasi-static compression ranging from â100 to â230 MPa, while dynamic compression loading showed a 10-30% increase in peak strength magnitude, with strain rate sensitivities similar to those of aluminum-matrix composite materials. X-ray tomographic investigation of the post-compression loaded foam microstructures revealed sharp differences in deformation modes, with the unalloyed-Al foam failing initially by matrix deformation, while the alloy-matrix foams failed more abruptly through the formation of sharp crush bands oriented at about 45° to the compression axis. These foams displayed pronounced energy-absorbing capabilities, suggesting their potential use in packaging applications or for impact protection; proper tailoring of matrix and microsphere strengths would result in optimized syntactic foam properties.
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Dorian K. Balch, John G. O'Dwyer, Graham R. Davis, Carl M. Cady, George T. III, David C. Dunand,