  Single particle states in a chain with quasiperiodic potential show a
metal-insulator transition upon the change of the potential strength. We
consider two particles with local interaction in the single particle insulating
regime. The two particle states change from being localized to delocalized upon
an increase of the interaction strength to a nonperturbative finite value. At
even larger interaction strength the states become localized again. This
transition of two particle bound states into a correlated metal is due to a
resonant mixing of the noninteracting two particle eigenstates. In the
discovered correlated metal states two particles move coherently together
through the whole chain, therefore contributing to a finite conductivity.
