Studies of Nanostructured Fe50Ni25Al25 Powders Prepared by Mechanical Alloying
Nanostructured powders of Fe50Ni25Al25 were prepared by mechanical alloying in argon atmosphere from elemental Fe, Ni and Al powders. The obtained powders were characterized by, X-ray diffraction, Transmission Electron Microscopy and 57Fe Mossbauer Spectroscopy. A detailed analysis of the diffraction patterns reveals a fast decrease of the crystalline size in the first hour of milling, after we obtained a stationary state. The final lattice parameter of this structure is close to 0.2895 nm. For the first milling time, Mossbauer spectra are composed of magnetic contribution characteristic of alpha iron and paramagnetic contribution attributed to Fe-Al (rich in Al). The formation of disordered solid solution Fe50Ni25Al25 is complete after 48 hours of milling.