Evolution of phases in Al-Pd-Co alloys

► Al-Pd-Co system was studied in non- and near-equilibrium states. ► Combinations of U, β and Al5Co2 phases were identified in the studied alloys. ► U-phase was observed as dominant phase. ► Non-equilibrium U-phase was found to consist of 2-3 compositional mutations. ► Mutations of U-phase exhibited compositional features of their parent phases.