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The Composition Effect on the Nanocrystallization of Finemet Amorphous Alloys

  • J. Zhu (a1), T. Pradell (a2), N. Clavaguera (a3) and M. T. Clavaguera-Mora (a1)

Abstract

Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD), Neutron Diffraction (ND) and Mössbauer Spectroscopy (MS) were used to study the nanocrystallization process of Fe73.5Cu1Nb3Si22.5–xBx (x=5, 7, 8, 9 and 12) amorphous alloys. Both the temperature range and the activation energy of Fe(Si) phase precipitation from the amorphous martrix increase with the initial B composition. The initial Si composition influences the mechanism of the nanocrystallization: for the Si rich samples, the beginning of nucleation and growth processes is interface controlled, for the B rich samples it is diffusion controlled. Secondary crystallization from the remaining amorphous is mainly Fe3B and Fe2B, the ratio of Fe3B/Fe2B being dependent on the initial composition too.

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The Composition Effect on the Nanocrystallization of Finemet Amorphous Alloys

  • J. Zhu (a1), T. Pradell (a2), N. Clavaguera (a3) and M. T. Clavaguera-Mora (a1)

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