Influence of macroscopic graphite particulates on the damping properties of Zn-Al eutectoid alloy
| Autor: | JianNing Wei, ShiHua Song, MingLiang Ma, FuSheng Han, GenMei Li, WeiJun Xie, KongGang Hu |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | Science in China Series G: Physics, Mechanics and Astronomy. 52:70-75 |
| ISSN: | 1862-2844 1672-1799 |
| DOI: | 10.1007/s11433-009-0007-3 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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