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Abstract
Amorphous alloys were formed by room-temperature 200 keV xenon ion mixing of multilayered films in the Zr-Nb system that has a positive heat of formation (+6 kJ mol−1) and the ion-induced amorphization was found to be discontinuous in the composition range. Thermodynamic calculation was conducted and a free-energy diagram, which concerns free-energy curves of the amorphous phase and the initial state of the multilayered films with excess interfacial energy, was constructed. An interpretation to the observed discontinuity of amorphization range was presented based on the calculated free-energy diagram. In addition, two new metastable crystalline phases both of fcc structure with different lattice parameters were formed in the composition range close to pure zirconium and niobium, respectively.
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