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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Damping capacity and compressive characteristic in some aluminum foams
CHENG He-fa(程和法)1,2, HUANG Xiao-mei(黄笑梅)2,
WEI Jian-ning(魏建宁)1, HAN Fu-sheng(韩福生)1

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;

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

ISSN 1672-7029
CN 43-1423/U

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