Short-range and medium-range order in Ca7Mg3 metallic glass
作者： Zhao-Yang Hou , Li-Xia Liu , Rang-Su Liu , Ze-An Tian , Jin-Guo Wang
DOI: 10.1063/1.3357304
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摘要: A molecular dynamics simulation has been performed on the rapid quenching processes of Ca7Mg3 alloy including 100 000 atoms. The structures short-range order (SRO) and medium-range (MRO) in metallic glass are investigated by means several structural analysis methods. It is found that SRO can be modeled neither a uniquely prescribed stereo-chemical structure nor five Bernal polyhedra but rather various types basic clusters which icosahedron dominant. local energy together with geometrical constraint plays very important roles favorable metal glasses. MRO characterized certain extended icosahedral combined intercross-sharing atoms form chains or dendrites, different from fcc building schemes for glasses significant chemical SRO. size distributions these present magic numbe...
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