It is well known that screw dislocations are step sources that allow crysta
ls to grow at low driving forces. Growth is accelerated at the outcrop of a
screw dislocation generating a spiral hillock. This makes the intersection
of a screw dislocation and a crystal surface a so-called velocity source.
In this paper the interaction between dislocation growth, 2D-nucleation and
misorientation step flow is investigated for a wide range of driving force
s by means of Monte Carlo simulations of growth of the Kossel (100) surface
. The interactions between the different growth mechanisms are shown to agr
ee with a general model for velocity source behavior, which allows for a si
mple analytical expression of the growth rate. This expression can be used
in a continuum description of crystal growth. Finally, dislocation etching
is studied and compared with dislocation growth. (C) 2000 Elsevier Science
B.V. All rights reserved.