  The phase diagram of strongly interacting matter at non-zero temperature and
baryon chemical potential is calculated within a 3-flavor NJL-type quark model
with realistic quark masses. The model exhibits spontaneous chiral symmetry
breaking as well as diquark condensation in the two-flavor
color-superconducting phase and in the color-flavor locked phase. We
investigate the color-flavor unlocking phase transition, taking into account
self-consistently calculated effective quark masses. We find that it is mainly
triggered by a first order phase transition with respect to the strange quark
mass. It takes place at much higher values of the chemical potential than the
transition to the hadronic phase such that we find a relatively large region in
the phase diagram where the two-flavor color-superconductor seems to be the
most favored state.
