1. Physical Metallurgy Laboratory, Mechanical Engineering Department, Aristotle University of Thessaloniki, P.O. Box 490, 54124 Thessaloniki, Greece
2. Department of Mechanical Engineering, Frederick University, 1036 Nicosia, Cyprus
3. National Research Council Canada, 75 de Mortagne, Boucherville, QC, Canada H1Y 2V9
4. Department of Light Weight Design, Metal Foam Centre, Fraunhofer Institute for Machine Tools and Forming Technologies, 09126 Chemnitz, Germany
5. Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan