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Microstructural evolution of FINEMET type alloys with chromium: An electron microscopy study

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Abstract

Microstructural changes in Fe73.5−xCrxCu1Nb3Si13.5B9 (0⩽x⩽5) alloys with thermal treatment were studied by electron microscopy. In a first stage, around 800 K, an Fe(Si) nanocrystalline phase is formed in the amorphous residual matrix. Crystallization onset is enhanced with the Cr content of the alloy. In a second stage, around 950 K, full crystallization of the samples leads to the formation of a body centred cubic (b.c.c.) boride-type unknown crystal phase with a lattice parameter of a=1.52 nm, and recrystallization of the previous Fe(Si) nanophase also occurs. No qualitative differences were found between dynamic and isothermal crystallization. The size effect for thin samples is limited to a lowering of crystallization temperatures. For isothermal nanocrystallization in the temperature range 775–900 K, the mean grain size of the nanocrystals increases for short annealing times to stabilize at a constant value of about 10–15 nm for long annealing times. The stabilized grain size increases with increasing annealing temperature and slightly decreases with the Cr content of the alloy.

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Millán, M., Conde, C.F. & Conde, A. Microstructural evolution of FINEMET type alloys with chromium: An electron microscopy study. JOURNAL OF MATERIALS SCIENCE 30, 3591–3597 (1995). https://doi.org/10.1007/BF00351870

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