  We study the influence of the atomic structure in the vicinity of voids on
their growth rate anisotropy. In the first part, we model the atomic structure
in the vicinity of nanovoids in Fe and W using the advanced Molecular Statics
method. In the second part, we use the earlier obtained equations that taking
the influence of elastic fields into account to calculate the shifting rate of
the void surface elements, and to evaluate the components of the strain tensor
we use the atomic structure modeling results from the first part. The
calculations are performed for voids of several sizes at certain
oversaturation's in a wide temperature range. The simulation results for the
mentioned metals with a bcc structure show that displacements of atoms located
along the crystallographic directions of the 100, 110, 111 types in the
vicinity of the voids are significantly different, and this anisotropy of atom
displacements leads to a reduction of spherical symmetry for the shifting rate
of the surface elements. As the result, the initially spherical void shape
becomes faceted.
