Abstract

In the Fe-Nb system, amorphous alloy, metastable crystalline fcc and hexagonal phases were formed in Nb-rich multilayered films by room temperature 200 keV xenon ion mixing. A heat of formation diagram of the system was constructed based on Miedema's model and Alonso's calculation method, and the diagram gave a relevant interpretation for the observed phase formation. The formation of fcc metastable phase can be interpreted by a reverse martensitic transition of bcc-fcc. The amorphous and hexagonal phases are thought to form through a traditional nucleation and growth mechanism with an additional consideration of the irradiation effect, which kinetically hindered the formation of a complicated intermediate compound.

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