  A detailed study of the paramagnetic to ferromagnetic phase transition in the
one-band Hubbard model in the presence of binary alloy disorder is presented.
The influence of the disorder (with concentration $x$ and $1-x$ of the two
alloy ions) on the Curie temperature $T_{c}$ is found to depend strongly on
electron density $n$. While at high densities, $n>x$, the disorder always
reduces $T_c$, at low densities, $n<x$, the disorder can even \emph{enhance}
$T_c$ if the interaction is strong enough. At the particular density $n=x$ (i.
e. not necessarily at half filling) the interplay between disorder-induced band
splitting and correlation induced Mott transition gives rise to a new type of
metal-insulator transition.
