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- R. E. Ryltsev
- Ural Branch of Russian Academy of Sciences 1 Institute of Metallurgy, , 101 Amundsen Str., 620016 Ekaterinburg, Russia
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- B. A. Klumov
- Russian Academy of Sciences 3 L.D. Landau Institute for Theoretical Physics, , 2 Kosygina Str., 119334 Moscow, Russia
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- N. M. Chtchelkatchev
- Ural Branch of Russian Academy of Sciences 1 Institute of Metallurgy, , 101 Amundsen Str., 620016 Ekaterinburg, Russia
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- K. Yu. Shunyaev
- Ural Branch of Russian Academy of Sciences 1 Institute of Metallurgy, , 101 Amundsen Str., 620016 Ekaterinburg, Russia
説明
<jats:p>Using molecular dynamics simulations with embedded atom model potential, we study structural evolution of Cu64.5Zr35.5 alloy during the cooling in a wide range of cooling rates γ ∈ (1.5 ⋅ 109, 1013) K/s. Investigating short- and medium-range orders, we show that the structure of Cu64.5Zr35.5 metallic glass essentially depends on cooling rate. In particular, a decrease of the cooling rate leads to an increase of abundances of both the icosahedral-like clusters and Frank-Kasper Z16 polyhedra. The amounts of these clusters in the glassy state drastically increase at the γmin = 1.5 ⋅ 109 K/s. Analysing the structure of the glass at γmin, we observe the formation of nano-sized crystalline grain of Cu2Zr intermetallic compound with the structure of Cu2Mg Laves phase. The structure of this compound is isomorphous with that for Cu5Zr intermetallic compound. Both crystal lattices consist of two types of clusters: Cu-centered 13-atom icosahedral-like cluster and Zr-centered 17-atom Frank-Kasper polyhedron Z16. That suggests the same structural motifs for the metallic glass and intermetallic compounds of Cu–Zr system and explains the drastic increase of the abundances of these clusters observed at γmin.</jats:p>
収録刊行物
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- The Journal of Chemical Physics
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The Journal of Chemical Physics 145 (3), 2016-07-20
AIP Publishing