Abstract
Cluster characteristics of Mg51Zn20 binary phase are analyzed using atomic density radial distribution method. Then icosahedron Zn2Mg11 cluster, having the highest relative atomic density 2.45, is highlighted because of the most close-packed structure. Using cluster-plus-glue-atom model and Zn2Mg11 cluster, eutectic composition Zn28.1Mg71.9 of Mg–Zn binary system can be simply expressed as: [Zn2Mg11] + (Zn2.5Mg0.5). Therefore the most efficient packing icosahedron Zn2Mg11 is also eutectic-related cluster. Finally, using general cluster formula [cluster](glue atoms)x(x = 1, 3), Mg-based Mg67Zn28Ca5 bulk metallic glass may be deciphered via the most close-packed eutectic cluster Zn2Mg11 as: [Zn2Mg11] + (Zn2Ca1).
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