Distributions of hyperfine parameters in nanocrystalline Fe78Al4Nb5B12Cu1 alloys

Abstract Magnetic properties of nanocrystalline Fe 78 Al 4 Nb 5 B 12 Cu 1 alloy were investigated by Mossbauer spectroscopy. As-quenched amorphous ribbon was flash annealed at temperature range of between 350 and 700°C to obtain different stages of crystallization. Mossbauer spectra consist of both sharp sextet due to BCC-Fe(Al) phase and two binomially distributed sextets due to amorphous matrix and interface layer, respectively. Distribution of various hyperfine parameters were obtained and special focus was given to the structure of interfacial layer. The flash anneal starts the crystallization at 400°C, and shows Fe 2 B phase at 550°C. The fraction of crystalline phase produced by annealing was as high as 46% at 550°C.