Features of local atomic structure of nanocrystalline disordered Fe–M (M=Ge, Sn, Al, Si) alloys: EXAFS-study

The EXAFS-study (Fe, Sn and Ge K-edges) of disordered by mechanical activation binary supersaturated nanocrystalline solid solutions Fe–Al, Fe–Ge, Fe–Sn and Fe–Si is presented. The EXAFS-spectra are processed by solving the inverse binary problem, using the EXAFS-spectrum of the Fe K-edge only or combining the EXAFS-spectra on two K-edges, Fe and Ge or Fe and Sn. The parameters of partial correlation functions indicate chemical short-range ordering, high local static distortions in the lattice, increasing with metalloid content. The macrostructure of other type is forming through an initial, “local” stage within the bcc lattice.