Effects of macroscopic bulk defects on the damping behaviors of materials

A large number of macroscopic pores or graphite participates were introduced into commercially pure Al and ZA27 alloy by infiltration process to comparatively study the influence of macroscopic defects on the damping behaviors of the materials. The mean diameter of the bulk defects is ( 1.0 ± 0.5) m...

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Bibliographic Details
Published in:Science China. Mathematics 2001-05, Vol.44 (5), p.655-661
Main Authors: Ma, Zhonghua, Han, Fusheng, Wei, Jianning, Gao, Junchang
Format: Article
Language:English
Subjects:
Aluminum
Damping capacity
Defects
Fractions
Graphite
High temperature
Internal friction
Particulates
Zinc base alloys
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Summary:A large number of macroscopic pores or graphite participates were introduced into commercially pure Al and ZA27 alloy by infiltration process to comparatively study the influence of macroscopic defects on the damping behaviors of the materials. The mean diameter of the bulk defects is ( 1.0 ± 0.5) mm, and the volume fractions of pores and graphite particulates are in the range of 50%– 75% and 19%–94%, separately. It is shown that addition of a number of pores or graphite particulates can significantly improve the damping of commercially pure AI, due to the comprehensive effects of the macroscopic and microscopic defects. However, the pores have little effect on the damping capacity of high damping ZA27 alloy, and graphite particulates make the high temperature internal friction peak decrease. It is considered that graphite particulates may repress the intrinsic damping mechanism of ZA27 alloy.
ISSN:1006-9283
1674-7283
1862-2763
1869-1862
DOI:10.1007/BF02876713