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Effects of cell parameters at low strain rates on the mechanical properties of metallic foams of Al and 7075-T6 alloy processed by pressurized infiltration casting method

Published online by Cambridge University Press:  04 September 2018

Bhasker Soni  and
Somnath Biswas
Bhasker Soni
Affiliation:
Department of Physics, The LNM Institute of Information Technology, Jaipur-302031, India
Somnath Biswas*
Affiliation:
Department of Physics, The LNM Institute of Information Technology, Jaipur-302031, India
*
a)Address all correspondence to this author. e-mail: somnath@lnmiit.ac.in
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Abstract

Cell morphology and relative density (ρrel) are two crucial intrinsic parameters controlling the mechanical properties of metal foams (MFs) and directly depend on their structure (closed/open-cell) and composition (affecting processing parameters). Here, we report on compressive studies of MFs of aluminum (Al) and 7075-T6 alloy processed via a customized route at strain rate, έ = 0.002 and 2.0 s−1. In both sets of MFs, the strength and apparent elastic modulus (E) monotonically increased with ρrel at both έ. At έ = 2.0 s−1, an increase in cell size (Cs) enhanced the strength of both sets of MFs, while at έ = 0.002 s−1, only the alloy foams showed strength increment. The densification strain (εd) of Al foams at έ = 0.002 s−1 monotonically decreased with increasing ρrel, whereas the alloy foams collapsed before the onset of densification. None of the MFs showed any particular trend of εd at έ = 2.0 s−1. The studies conclude that the mechanical properties of MFs with similar morphology, foam parameters, and processing route depend on έ and Cs. Absorption energy (W) and absorption efficiency (Im) of the two sets of MFs were also compared.

Keywords

metal foamselastic modulusyield strength
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3418 - 3429
Copyright
Copyright © Materials Research Society 2018 

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