ANELASTIC PROPERTIES AND SOLID-STATE REACTIVITY OF FE-AL NANOSTRUCTURED INTERMETALLIC COMPOUNDS

Iron and Aluminium elemental powders mixed in the atomic ratio Fe50Al5 0 and Fe75Al25 have been alloyed using an high energy mill system. The structural transformation of the milled products has been followed us ing XRD techniques. Samples obtained from cold-consolidation of the mi lled powders have been used for Elastic Energy Dissipation measurement s (IF) and analysed in the temperature range 300-980 K. The XRD spectr a corresponding to specimens milled for long times reveal the formatio n of the FeAl and Fe3Al nanostructured intermetallic compounds. The IF spectra show two relaxational damping peaks P-1,P-2 in the temperatur e range 600-980 K. The peak evolution for different milling treatments indicates a Zener and a grain-boundary relaxation mechanisms for P-1 and P-2 respectively.