Abstract
Magnetic properties of nanocrystalline Fe 78Al 4Nb 5B 12Cu 1 alloy were investigated by Mössbauer spectroscopy. As-quenched amorphous ribbon was flash annealed at temperature range of between 350 and 700°C to obtain different stages of crystallization. Mössbauer 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 2B phase at 550°C. The fraction of crystalline phase produced by annealing was as high as 46% at 550°C.
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