  Using molecular dynamics simulations with embedded atom model potential, we
study structural evolution of ${\rm Cu_{64.5}Zr_{35.5}}$ alloy during the
cooling 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 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
$\gamma_{\rm min}=1.5\cdot 10^{9}$ 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 ${\rm
Cu_5Zr}$ intermetallic compound. Both crystal lattices consist of two type 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 and explains the drastic increase of
the abundances of these clusters observed at $\gamma_{\rm min}$.
