Abstract
Abstract X-ray diffraction (XRD) and Mossbauer spectroscopy were used to study the annealing of the Fe 40 Ni 38 Mo 4 B 18 amorphous alloy. The samples were isothermally annealed in the 858–878 K temperature range several times. Two crystalline phases were observed in the annealed samples: FeNi 3 and (Fe, Ni, Mo) 23 B 6 . Preliminary results indicate that assuming a linear relationship between the area under the main XRD peak associated with the FeNi 3 phase and its volume fraction, this can be fitted to a Johnson–Mehl–Avrami equation with an exponent n close to 1.0. Mossbauer results show a broad magnetic hyperfine field distribution in as-received samples and, consistent with XRD results, a sextet attributed to precipitates of FeNi 3 ( B hf =29.5 T) for long annealing times.
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