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Using molecular dynamics simulations with embedded atom model potential, westudy structural evolution of ${\rm Cu_{64.5}Zr_{35.5}}$ alloy during thecooling in a wide range of cooling rates $\gamma\in(1.5\cdot 10^{9},10^{13})$K/s. Investigating short- and medium-range order, we show that structure of${\rm Cu_{64.5}Zr_{35.5}}$ metallic glass essentially depends on cooling rate.In particular, a decrease of the cooling rate leads to a increase of abundancesof both the icosahedral-like clusters and Frank-Kasper Z16 polyhedra. Theamounts of these clusters in the glassy state drastically increase at the$\gamma_{\rm min}=1.5\cdot 10^{9}$ K/s. Analysing the structure of the glass at$\gamma_{\rm min}$, we observe the formation of nano-sized crystalline grain of${\rm Cu_2Zr}$ intermetallic compound with the structure of ${\rm Cu_2Mg}$Laves phase. The structure of this compound is isomorphous with that for ${\rmCu_5Zr}$ intermetallic compound. Both crystal lattices consist of two type ofclusters: Cu-centered 13-atom icosahedral-like cluster and Zr-centered 17-atomFrank-Kasper polyhedron Z16. That suggests the same structural motifs for themetallic glass and intermetallic compounds and explains the drastic increase ofthe abundances of these clusters observed at $\gamma_{\rm min}$.

Cooling rate dependence of simulated ${\rm Cu_{64.5}Zr_{35.5}}$ metallic glass structure