Damping capacity and compressive characteristic in some aluminum foams
(1. Laboratory of Internal Friction and Defects in Solids,
Institute of Solid State Physics, Chinese Academy of Sciences,
Hefei 230031, China
2. College of Materials Science and Engineering,
Hefei University of Technology, Hefei 230009, China;)
Institute of Solid State Physics, Chinese Academy of Sciences,
Hefei 230031, China
2. College of Materials Science and Engineering,
Hefei University of Technology, Hefei 230009, China;)
Abstract: The compressive behavior, energy absorption and damping capacity of Al-28% Zn alloy foam, Al-10% Mg alloy foam and commercial pure aluminum foam with open cell were investigated. The Al-28 % Zn alloy foam exhibits the typical deformation behavior of brittle foam in static compression, and a much higher energy absorption capacity than the Al-10%Mg alloy foam and pure aluminum foam to the densification strain. Over a large plastic strain range, the energy absorption efficiency of the Al-28 % Zn alloy foam keeps nearly constant and above 80%. The experiments on the internal friction of the three foams are also conducted on a multifunction internal friction apparatus (MFIFA). The Al-28%Zn alloy foam exhibits a high damping capacity which is three to four times larger than those of the pure aluminum foam and Al-28%Mg alloy foam around room temperature. The mechanism for the high damping capacity of the foamed Al-28%Zn alloy may be associated with the viscous sliding at the interface between the soft phase α and the brittle rich Zn phase η in its base metal during vibration.
Key words: damping capacity; compressive behavior; energy absorbing capacity; aluminum foam