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On the microstructure and thermal stability of rapidly quenched Fe–B alloys in the intermediate composition range between the crystalline and amorphous states

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Abstract

The structure and the thermal stability of the Fe0.89B0.11 rapidly quenched alloy have been investigated. Transmission Mössbauer measurements were carried out as a function of temperature in the range from 148 K to 513 K. Room temperature x-ray diffraction and transmission and conversion-electron Mössbauer experiments, as well as 4.2 K spin-echo nuclear magnetic resonance measurements, were also performed after some selected thermal treatments for one hour between 523 K and 1273 K. Based on these experiments it is suggested that the alloy is inhomogeneous at nanoscopic scale and consists of a fine dispersion of a defective boride phase with an o-Fe3B-like short-range order, embedded in an α-Fe matrix. This result gives support to the models which indicate phase separation in the amorphous phase with o-Fe3B short-range order prevailing in the hypereutectic iron concentration range. This phase was found to be less stable than the undefective one present in the less boron concentrated alloys. The transformation into the equilibrium phases, analyzed with an Arrhenius-type temperature dependence for the increase of the relative fraction of Fe2B, led to an activation energy Ea = 1.38 ± 0.68 eV/atom.

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Authors and Affiliations

  1. Departamento de Fisica Facultad de Ciencias Exacias, Universidad Nacional de La Plata, Casilla de Correos 67, 1900, La Plata, Argentina

    M. B. Fernández van Raap & F. H. Sánchez

  2. Physics Department, University of Connecticut, 2152 Hillside Road, Storrs, 06269, Connecticut, USA

    Y. D. Zhang

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  1. M. B. Fernández van Raap
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  2. F. H. Sánchez
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  3. Y. D. Zhang
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Fernández van Raap, M.B., Sánchez, F.H. & Zhang, Y.D. On the microstructure and thermal stability of rapidly quenched Fe–B alloys in the intermediate composition range between the crystalline and amorphous states. Journal of Materials Research 10, 1917–1926 (1995). https://doi.org/10.1557/JMR.1995.1917

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  • DOI: https://doi.org/10.1557/JMR.1995.1917

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