Influence of macroscopic graphite particulates on the damping properties of Zn-Al eutectoid alloy |
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Authors: | JianNing Wei ShiHua Song KongGang Hu WeiJun Xie MingLiang Ma GenMei Li and FuSheng Han |
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Institution: | (1) College of Science, Jiujiang University, Jiujiang, 332005, China;(2) Department of Mechanical Engineering, Jiujiang University, Jiujiang, 332005, China;(3) Department of Materials Science and Engineering, Jiujiang University, Jiujiang, 332005, China;(4) Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China |
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Abstract: | The paper presents in detail the effects of macroscopic graphite (Gr) particulates on the damping behavior of Zn-Al eutectoid
alloy (Zn-Al). Macroscopic defects are graphite particulates with sizes of the order of a millimeter (0.5 mm and 1.0 mm).
Macroscopic graphite particulate-reinforced Zn-Al eutectoid alloys were prepared by the air pressure infiltration process.
The damping characterization was conducted on a multifunction internal friction apparatus (MFIFA). The internal friction (IF),
as well as the relative dynamic modulus, was measured at different frequencies over the temperature range of 20 to 400°C.
The damping capacity of the Zn-Al/Gr, with two different volume fractions of macroscopic graphite particulates, was compared
with that of bulk Zn-Al eutectoid alloy. The damping capacity of the materials is shown to increase with increasing volume
fraction of macroscopic graphite particulates. Two IF peaks were found in the IF-temperature curves. The first is a grain
boundary peak, which is associated with the diffusive flux on a boundary between like phases, Al/Al. Its activation energy
has been calculated to be 1.13±0.03 eV and the pre-exponential factor is 10−14 s in IF measurements. The second is a phase transition peak, which results from the transformation of Zn-Al eutectoid. In
light of internal friction measurements and differential scanning calorimetry (DSC) experiments, its activation energy has
been calculated to be 2.36±0.08 eV.
Supported by the Natural Science Foundation of Jiangxi Province of China (Grant No. 0550050) and the Jiangxi Provincial Department
of Education of China (Grant No. 13-3-B-04) |
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Keywords: | Zn-Al eutectoid alloy damping internal friction graphite particulate |
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