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Metals 2014, 4(4), 530-548; doi:10.3390/met4040530

Dynamic and Thermal Properties of Aluminum Alloy A356/Silicon Carbide Hollow Particle Syntactic Foams

1
Composite Materials and Mechanics Laboratory, Mechanical and Aerospace Engineering Department, Polytechnic School of Engineering, New York University, Brooklyn, NY 11201, USA
2
Deep Springs Technology, LLC, 4750 W. Bancroft St., Toledo, OH 43615, USA
3
Army Research Laboratory, RDRL-WMM-D, Aberdeen Proving Ground, MD 21005-5069, USA
*
Author to whom correspondence should be addressed.
Received: 8 August 2014 / Revised: 27 November 2014 / Accepted: 27 November 2014 / Published: 2 December 2014
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Abstract

Aluminum alloy A356 matrix syntactic foams filled with SiC hollow particles (SiCHP) are studied in the present work. Two compositions of syntactic foams are studied for quasi-static and high strain rate compression. In addition, dynamic mechanical analysis is conducted to study the temperature dependent energy dissipation and damping capabilities of these materials. The thermal characterization includes study of the coefficient of thermal expansion (CTE). A356/SiCHP syntactic foams are not strain rate sensitive as the compressive strength displayed little variation between the tested strain rates of 0.001–2100 s−1. Microscopic analysis of the high strain rate compression tested specimens showed that the fracture is initiated by the failure of hollow particles at the onset of the plastic deformation region. This is followed by plastic deformation of the matrix material and further crushing of particles. The syntactic foams showed decrease in storage modulus with increasing temperature and the trend was nearly linear up to 500 °C. The alloy shows a similar behavior at low temperature but the decrease in storage modulus increases sharply over 375 °C. The loss modulus is very small for the tested materials because of lack of viscoelasticity in metallic materials. The trend in the loss modulus is opposite, where the matrix alloy has lower loss modulus than syntactic foams at low temperature. However, over 250 °C the matrix loss modulus starts to increase rapidly and attains a peak around 460 °C. Syntactic foams have higher damping parameter at low temperatures than the matrix alloy. Incorporation of SiCHP helps in decreasing CTE. Compared to the CTE of the matrix alloy, 23.4 × 10−6 °C−1, syntactic foams showed CTE values as low as 11.67 × 10−6 °C−1. View Full-Text
Keywords: metal matrix syntactic foam; SiC hollow particle; high strain rate compression; damping parameter metal matrix syntactic foam; SiC hollow particle; high strain rate compression; damping parameter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Cox, J.; Luong, D.D.; Shunmugasamy, V.C.; Gupta, N.; Strbik, O.M., III; Cho, K. Dynamic and Thermal Properties of Aluminum Alloy A356/Silicon Carbide Hollow Particle Syntactic Foams. Metals 2014, 4, 530-548.

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