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Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 607429, 9 pages
http://dx.doi.org/10.1155/2014/607429
Research Article

The Role of Foaming Agent and Processing Route in Mechanical Performance of Fabricated Aluminum Foams

1Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
2Physical-Technological Institute of Metals and Alloys, National Academy of Sciences of Ukraine, Kiev 03142, Ukraine
3Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan

Received 18 December 2013; Revised 4 March 2014; Accepted 5 March 2014; Published 31 March 2014

Academic Editor: Alexander Tsouknidas

Copyright © 2014 Alexandra Byakova et al. 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.

Abstract

The results of this study highlight the role of foaming agent and processing route in influencing the contamination of cell wall material by side products, which, in turn, affects the macroscopic mechanical response of closed-cell Al-foams. Several kinds of Al-foams have been produced with pure Al/Al-alloys by the Alporas like melt process, all performed with and without Ca additive and processed either with conventional TiH2 foaming agent or CaCO3 as an alternative one. Damage behavior of contaminations was believed to affect the micromechanism of foam deformation, favoring either plastic buckling or brittle failure of cell walls. No discrepancy between experimental values of compressive strengths for Al-foams comprising ductile cell wall constituents and those prescribed by theoretical models for closed-cell structure was found while the presence of low ductile and/or brittle eutectic domains and contaminations including particles/layers of Al3Ti, residues of partially reacted TiH2, and Ca bearing compounds, results in reducing the compressive strength to values close to or even below those of open-cell foams of the same relative density.