Enhancing Damping of Aluminium Using SiC and∕or Ge

[+] Author and Article Information
Narasimalu Srikanth, Manoj Gupta

Department of Mechanical Engineering,  National University of Singapore, 9 Engineering Drive 1, Singapore - 117576mpegm@nus.edu.sg

J. Eng. Mater. Technol 127(3), 289-294 (Feb 01, 2005) (6 pages) doi:10.1115/1.1924557 History: Received July 02, 2004; Revised February 01, 2005

Metallic material with enhanced stiffness and damping characteristics is actively sought in the design of dynamic mechanical systems for mechanical components. Germanium is known to remain distinct in an aluminium matrix without forming any intermetallic phases. The effect of the presence of germanium particles in the aluminium matrix is of interest and can be studied in terms of variation in overall damping property, which signifies the internal friction arising at the matrix-particle interface. Damping was measured using an impact-based vibration measurement of a suspended beam coupled with circle-fit approach. Results showed the presence of 1.9 vol. % of Ge in the Al matrix increases the damping capacity by 46% compared to pure Al which is equal to the improvement offered by the presence of 10.2 vol. % of SiC particulates. The present work also extends the study of the additional reinforcement rendered by the presence of SiC particulates along with Ge particulates. The experimental observation of this enhancement in damping characteristics has been rationalized in terms of the microstructural changes such as the presence of plastic zones at the matrix-reinforcement interface.

Copyright © 2005 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 3

Equivalent plastic strain contour plot in the unit cell model containing composition equivalent to (a) Al-1.9 vol. % Ge and (b) Al‐1.8vol.%Ge∕2.9vol.%SiC

Grahic Jump Location
Figure 1

(a) SEM micrograph showing the distribution of Ge and SiC particulate in the Al‐1.8Ge∕2.9SiC sample. (b) SEM micrograph showing the particulate∕matrix interface of Ge in the Al‐1.8Ge∕2.9SiC sample. (c) SEM micrograph showing the particulate∕matrix interface of SiC in the Al‐1.8Ge∕2.9SiC sample.

Grahic Jump Location
Figure 2

(a) Circle-fit plot of raw FRF data for the Al‐1.8Ge∕2.9SiC sample. (b) Use of the natural frequency and two data points to derive the damping factor.




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