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http://dx.doi.org/10.12656/jksht.2021.34.5.218

Damping Capacities of Mg-Al alloy with As-Cast and Discontinuous Precipitates Microstructures  

Jun, Joong-Hwan (Industrial Materials Processing R&D Department, Korea Institute of Industrial Technology)
Publication Information
Journal of the Korean Society for Heat Treatment / v.34, no.5, 2021 , pp. 218-225 More about this Journal
Abstract
In this study, damping capacities were comparatively investigated for Mg-9%Al alloy with as-cast (AC) and fully discontinuous precipitates (DPs) microstructures, respectively. The DPs microstructure was obtained by solution treatment at 678 K for 24 h, followed by furnace cooling to RT. The AC microstructure was typically characterized by partially divorced eutectic β(Mg17Al12) phase particles distributed along the α-(Mg) matrix cell boundaries. The DPs microstructure showed lamellar morphology consisting of α and β thin layers with various interlamellar spacings. The DPs microstructure had better damping capacity than the AC microstructure in the strain-amplitude independent region, while in the strain-amplitude dependent region, the damping behavior was reversed. In view of the microstructural features of AC and DPs, the lower concentration of Al in the α-(Mg) phase for the DPs microstructure and the lower β phase number density for the AC microstructure would be responsible for the higher damping capacities in the strain-amplitude independent and strain-amplitude dependent regions, respectively.
Keywords
Mg-Al; Discontinuous precipitates; Damping capacity; Granato-Lucke model; (${\alpha}+{\beta}$) lamellar microstructure;
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