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The Effect of Matrix Composition on the Deformation and Failure Mechanisms in Metal Matrix Syntactic Foams during Compression

1
Department of Materials Physics, Loránd Eötvös University, Pázmány P. stny. 1/A, Budapest H-1117, Hungary
2
Department of Physics of Materials, Charles University, Ke Karlovu 5, Prague 2 121 16, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editor: Thomas Fiedler
Materials 2017, 10(2), 196; https://doi.org/10.3390/ma10020196
Received: 6 January 2017 / Revised: 6 February 2017 / Accepted: 14 February 2017 / Published: 17 February 2017
The influence of the matrix material on the deformation and failure mechanisms in metal matrix syntactic foams was investigated in this study. Samples with commercially pure Al (Al) and Al-12 wt % Si (AlSi12) eutectic aluminum matrix, reinforced by hollow ceramic spheres, were compressed at room temperature. Concurrently, the acoustic emission response and the strain field development on the surface were monitored in-situ. The results indicate that the plastic deformation of the cell walls is the governing mechanism in the early stage of straining for both types of foams. At large stresses, deformation bands form both in the Al and AlSi12 foam. In Al foam, cell walls collapse in a large volume. In contrast, the AlSi12 foam is more brittle; therefore, the fracture of precipitates and the crushing of the matrix take place within a distinctive deformation band, along with an occurrence of a significant stress drop. The onset stress of ceramic sphere failure was shown to be not influenced by the matrix material. The in-situ methods provided complementary data which further support these results. View Full-Text
Keywords: syntactic foams; acoustic emission; mechanical properties syntactic foams; acoustic emission; mechanical properties
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MDPI and ACS Style

Kádár, C.; Máthis, K.; Knapek, M.; Chmelík, F. The Effect of Matrix Composition on the Deformation and Failure Mechanisms in Metal Matrix Syntactic Foams during Compression. Materials 2017, 10, 196.

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