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Icosahedral medium-range order formed in Mg70Zn30 metallic glass: a larger-scale molecular dynamics simulation |
Hou Zhao-Yang(侯兆阳)a)† , Liu Rang-Su(刘让苏) b), Tian Ze-An(田泽安)b), and Wang Jin-Guo(王晋国) a) |
a College of Science, Xidian University, Xián 710071, China; b School of Physics and Microelectronics Science, Hunan University, Changsha 410082, China |
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Abstract A larger-scale Mg70Zn30 alloy system including 100000 atoms has been simulated by using the molecular dynamics method to investigate the icosahedral medium-range order (IMRO) formed in the Mg70Zn30 metallic glass. It is found that the simulated pair distribution function of Mg70Zn30 metallic glass is in good agreement with the experimental results. The glass transition temperature Tg is near 450 K under the cooling rate of 1×1012 K/s. The icosahedral local structures play a critical role in the formation of metallic glass, and they are the dominant local configurations in the Mg70Zn30 metallic glass. The IMRO in the Mg70Zn30 metallic glass is characterized by certain types of extended icosahedral clusters combined by intercross-sharing atoms in the form of chains or dendrites. The size distributions of these IMRO clusters present a magic number sequence of 19, 23, 25, 27, 29, 31, 33, 35, 37, 39,..., and the magic clusters can be classified into three types according to their compactness. The IMRO clusters grow rapidly in a low-dimensional way with cooling, but this growth is limited near Tg.
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Received: 05 November 2010
Revised: 08 January 2011
Accepted manuscript online:
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PACS:
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61.20.Ne
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(Structure of simple liquids)
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64.70.pe
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(Metallic glasses)
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81.70.pe
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61.46.Bc
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(Structure of clusters (e.g., metcars; not fragments of crystals; free or loosely aggregated or loosely attached to a substrate))
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 50831003) and the Special Fund for Basic Scientific Research of Central Colleges, Changán Univeristy (Grant No. CHD2009JC169). |
Cite this article:
Hou Zhao-Yang(侯兆阳), Liu Rang-Su(刘让苏), Tian Ze-An(田泽安), and Wang Jin-Guo(王晋国) Icosahedral medium-range order formed in Mg70Zn30 metallic glass: a larger-scale molecular dynamics simulation 2011 Chin. Phys. B 20 066102
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