  Molecular dynamics simulations were performed to study the effects of Si
solute on the glass formation and crystallization of Pd liquid. Pure Pd sample
prepared by quenching process with cooling rate of $10^{13}$ K/s can be in an
amorphous state but the structural analysis indicates there is nearly no
glass-forming motif in the sample. However, doping a small amount Si (Si
concentration ~ 4%) the sample can be vitrified at a cooling rate of $10^{12}$
K/s. The glass-forming motifs such as Pd-centered Z13, Si-centered Z9-like and
Mixed-ICO-Cube clusters with 5-fold local symmetry are found to be the dominant
short-range orders in the glassy samples. With the increasing of the Si-doping
concentration, these glass-forming motifs tend to aggregate and connect with
each other forming a network structure. Our calculated results revealed that Si
solutes in liquid Pd can significantly enhance the glass-forming ability.
