Abstract
The damping properties of an Mg alloy foam and its composite foams were investigated using a dynamic mechanical thermal analyzer. The results show that the loss factors of both the Mg alloy and its composite foams are insensitive to temperature and loading frequency when the temperature is less than a critical temperature T crit. However, it increases when the temperature exceeds the T crit values, which are 200 and 250°C for the Mg alloy foam and the Mg alloy/SiCp composite foams, respectively. The Mg alloy/SiCp composite foams exhibit a higher damping capacity than the Mg alloy foam when the temperature is below 200°C. By contrast, the Mg alloy foam exhibits a better damping capacity when the temperature exceeds 250°C. The variation in the damping capacity is attributed to differences in the internal friction sources, such as the characteristics of the matrix material, abundant interfaces, and interfacial slipping caused by SiC particles, as well as to macrodefects in the Mg alloy and its composite foams.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 51174060 and 51301109), the Science and Technology Department of Liaoning Province of China (No. 2013223004), and the Fundamental Research Funds for the Central Universities (No. 140203004).
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Huang, Wz., Luo, Hj., Mu, Yl. et al. Low-frequency damping behavior of closed-cell Mg alloy foams reinforced with SiC particles. Int J Miner Metall Mater 24, 701–707 (2017). https://doi.org/10.1007/s12613-017-1453-y
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DOI: https://doi.org/10.1007/s12613-017-1453-y