Abstract
The crystallization behaviour of the Metglas 2826 MB alloy (Fe40Ni38Mo4B18) has been studied using resistance measurements and X-ray diffraction techniques. Three annealing sequences were used to follow the process. Samples were annealed isothermally (a) at 780° C in a vacuum of 2×10−5 torr for times in the range 1 sec to 4 h, (b) for 2 h in an argon atmosphere at temperatures where the resistance curve indicated phase changes to occur, and (c) for 300 h in 100 torr of helium at 400, 600, 700 and 850° C. From these annealing sequences it was found that the alloy did not crystallize below 410° C and followed a crystallization process of: amorphous Fe40Ni38Mo4B18 → Fe x Ni23−x B6 (cubic)+glassy matrix → Fe x Ni23−x B6+(Fe, Ni) (FCC) → (Fe, Ni)3B(bct). This series of transformations was followed for Sequences (a) and (c) above, but was slightly different for Sequence (b). An orthorhombic (Fe, Ni)3 B phase was found in the samples annealed in a vacuum of 2×10−5 torr.
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Mizgalski, K.P., Inal, O.T., Yost, F.G. et al. Characterization of crystallization in Metglas 2826 MB alloy. J Mater Sci 16, 3357–3364 (1981). https://doi.org/10.1007/BF00586297
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DOI: https://doi.org/10.1007/BF00586297