A dodecagonal phase formed in an immiscible Co-Ag system by ion mixing of multilayers

In an immiscible Co-Ag system, a new Co-Ag dodecagonal phase is formed in the Co 50 Ag 50 multilayers upon room temperature 200 keV xenon-ion irradiation to a dose of 5×10 14 Xe + cm -2 . The mechanism of formation of the quasicrystalline phase is also discussed in terms of the far-from-equilibrium process of ion mixing, as well as the role of the interfacial free energy, stresses caused by size mismatch and the radiation-enhanced diffusion.