Damping properties of open cell microcellular pure Al foams

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/92571

Title: Damping properties of open cell microcellular pure Al foams
Author(s): Yang, Y. J.; Han, F. S.; Wen, C. E.; Shu, Y. F.
Abstract: Damping behaviours of the open cell microcellular pure Al foams fabricated by sintering and dissolution process with the relative density of 0·31–0·42 and the pore size of 112–325 μm were investigated. The damping characterisation was conducted on a multifunction internal friction apparatus. The internal friction (IF) was measured at frequencies of 1·0, 3·0 and 6·0 Hz over the temperature range of 298–725 K. The measured IF shows that the open cell pure Al foam has a damping capacity that is enhanced in comparison with pure Al. At a lower temperature (∼400 K), the IF of the open cell pure Al foams increases with decreasing relative density, with decreasing pore size and with increasing frequency. The IF peak was found at the temperature range of 433–593 K in the IF curves. It is clear that the IF peak is relaxational type and the activation energy associated with the IF peak is about 1·60 ± 0·02 eV. Defect effects can be used to interpret the damping mechanisms.
Publication type: Journal article
Source: Materials Science and Technology, Vol. 23, no. 11 (Nov 2007), pp. 1336-1340
Publication year: 2007
Keyword(s): Al foam; Damping properties; Internal friction; Sintering
Publisher: Maney Publishing
ISSN: 0267-0836
Publisher URL: http://dx.doi.org/10.1179/174328407x226707
Peer reviewed