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The Role of Foaming Agent and Processing Route in the Mechanical Performance of Fabricated Aluminum Foams
Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, 3 Krzhyzhanovsky Street, Kiev 03142, Ukraine
Physical-Technological Institute of Metals and Alloys, National Academy of Sciences of Ukraine, Kiev 04004, Ukraine
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
* Author to whom correspondence should be addressed.
Received: 30 March 2012; in revised form: 30 April 2012 / Accepted: 9 May 2012 / Published: 23 May 2012
(This article belongs to the Special Issue Metal Foams
Abstract: The results of the present study highlight the role of foaming agent and processing route in influencing the contamination of cell wall material by side products, which, in turn, affect the macroscopic mechanical response of closed-cell Al-foams. Several kinds of Al-foams have been produced with pure Al by the Alporas melt process and powder metallurgical technique, all performed either with conventional TiH2 foaming agent or CaCO3 as an alternative. Mechanical characteristics of contaminating products induced by processing additives, all of which were presented in one or another kind of Al-foam, have been determined in indentation experiments. Damage behavior of these contaminations affects the micro-mechanism of deformation and favors either plastic buckling or brittle failure of the cell walls. It is justified that there is no discrepancy between experimental values of compressive strengths for Al-foams comprising ductile Al + Al4Ca eutectic domains and those prescribed by theoretical models for closed-cell structure. However, the presence of low ductile Al + Al3Ti + Al4Ca eutectic domains and brittle particles/layers of Al3Ti, fine CaCO3/CaO particles, Al2O3 oxide network, and, especially, residues of partially reacted TiH2, results in reducing the compressive strength to values close to or even below those of open-cell foams of the same relative density.
Keywords: Al-based foams; foaming agents; processing; cell wall constituents; mechanical properties
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Byakova, A.; Gnyloskurenko, S.; Nakamura, T. The Role of Foaming Agent and Processing Route in the Mechanical Performance of Fabricated Aluminum Foams. Metals 2012, 2, 95-112.
Byakova A, Gnyloskurenko S, Nakamura T. The Role of Foaming Agent and Processing Route in the Mechanical Performance of Fabricated Aluminum Foams. Metals. 2012; 2(2):95-112.
Byakova, Alexandra; Gnyloskurenko, Svyatoslav; Nakamura, Takashi. 2012. "The Role of Foaming Agent and Processing Route in the Mechanical Performance of Fabricated Aluminum Foams." Metals 2, no. 2: 95-112.