Effects of Zn on the microstructure, mechanical properties, and damping capacity of Mg–Zn–Y–Zr alloys

► Novel paper to research the damping capacity of the Mg–Zn–Y–Zr alloy. ► Mg–Zn–Y–Zr alloys with different phase compositions are obtained by controlling the element Zn contents. ► The contribution of the different phases including the W-phase and long period stacking ordered (LPSO) phase to the mec...

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Veröffentlicht in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-07, Vol.528 (18), p.5914-5920
Hauptverfasser: Wang, Jingfeng, Song, Pengfei, Gao, Shan, Huang, Xuefei, Shi, Zhangzhi, Pan, Fusheng
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Sprache:eng
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Zusammenfassung:► Novel paper to research the damping capacity of the Mg–Zn–Y–Zr alloy. ► Mg–Zn–Y–Zr alloys with different phase compositions are obtained by controlling the element Zn contents. ► The contribution of the different phases including the W-phase and long period stacking ordered (LPSO) phase to the mechanical properties and damping capacities of the Mg–Zn–Y–Zr alloys are analyzed synthetically. ► The damping capacities of the Mg–Zn–Y–Zr alloys are analyzed and discussed by Granato–Lücke theory and G–L plots. The influences of Zn on the microstructure, mechanical properties, and damping capacity of as-extruded (Mg–5%Y–0.6%Zr) 1− x Zn x ( x = 2%, 4%, 6%, mass fraction) alloys were investigated by optical microscopy, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, tensile testing, and dynamic mechanical analysis (DMA). The phase composition and microstructure of the alloys displayed evident variations with changes in Zn content. When the mass fraction of Zn changed from 2% to 6%, the phases mainly consisted of a long period stacking ordered (LPSO) X-phase (Mg 12YZn) and a W-phase (Mg 3Y 2Zn 3). Comparison of the mechanical properties and damping capacities of the different phases showed that the X-phase benefits the mechanical properties of the alloy without drastic impairment to their damping capacities. The damping capacities are discussed in terms of the Granato–Lücke theory and G–L plots.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2011.04.002