X-ray diffraction and Mössbauer studies of mechanically alloyed Fe-Ni nanostructured powders

Fe-10 wt% Ni and Fe-20 wt% Ni nanostructured alloys were prepared using a planetary ball mill P 4 vario mill from Fritsch. The Fe (Ni) BCC solid solution was identified by X-ray diffraction, allowing also to follow the size and shape of crystalline grains. The higher the shock power, the smaller the grain size. The Mössbauer spectra of the nanostructured powders recorded at 77 and 300 K differ according to the shock power and the friction energy component while the hyperfine structure gives relevant information on the local structure environment of Fe atoms in relation with the milling mode process (shock or friction mode).