Paper Title:
Effect of Aging on Damping Capacity of AZ91 Alloy
  Abstract

Changes in microstructure and damping capacity with aging time for solutionized AZ91 (Mg-9%Al-1%Zn-0.2%Mn) alloy have been investigated based on experimental results from optical micrography, X-ray diffractometry, hardness test and damping capacity measurement vibrating in a flexural mode. Discontinuous β (Mg17Al12) precipitates form along the primary grain boundaries, the amount of which increases as the aging time increases. The hardness of α matrix with respect to aging shows a typical “S” shape, indicating a generation of fine continuous precipitation in the matrix during aging. The peak level of damping capacity for the AZ91 alloy is obtained after 1 hour of aging, over which the damping capacity becomes deteriorated continuously. The optimum density of continuous β precipitates with fine morphology, which may well act as pinning points for dislocation lines, might be responsible for the improvement of damping capacity.

  Info
Periodical
Materials Science Forum (Volumes 544-545)
Edited by
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
Pages
235-238
DOI
10.4028/www.scientific.net/MSF.544-545.235
Citation
J. H. Jun, G. H. Lee, J. M. Kim, K. T. Kim, W. J. Jung, "Effect of Aging on Damping Capacity of AZ91 Alloy", Materials Science Forum, Vols. 544-545, pp. 235-238, 2007
Online since
May 2007
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Price
$32.00
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