Abstract

Assisted by the interfacial free energy, metastable and fcc phases were formed by room temperature 200 keV xenon ion mixing of nano-sized multilayers in the Co–Ag system being immiscible at equilibrium and characterized by a large positive heat of formation. The formation mechanism of metastable phases is discussed in terms of the far-from-equilibrium process of ion mixing, the role of the interfacial free energy in enhancing alloying capability and the effect of valence electrons.

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