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Thermal evolution of ferromagnetic metallic glasses

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Abstract

A traditional TG apparatus was modified by placing two permanent magnets producing a controlled magnetic field (TG(M): Magneto Thermogravimetry). This technique proved to be useful to study both structural relaxation and crystallisation of ferromagnetic metallic glasses. Results obtained for the amorphous alloys Fe40Ni40P14B6 and Fe62.5Co6Ni7.5Zr6Nb2Cu1B15, are reported in this paper. Structural relaxation can be evaluated by measuring changes in Curie temperature induced by thermal treatments. Crystallisation in TG(M) is detected through a change in the measured apparent mass (difference between the sample mass and magnetic force driving it upward). These results were confirmed by DSC analysis. Whether the obtained crystalline phase is ferromagnetic, it can be identified through its Curie temperature, measured by TG(M). In fact the value of 770°C measured as Curie temperature of crystallised Fe62.5Co6Ni7.5Zr6Nb2Cu1B15led to conclude that the only ferromagnetic crystalline phase is a-Fe. These hypothesis was confirmed by XRD analysis, showing that the first crystallisation yields to a-Fe nanocrystals.

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Authors and Affiliations

  1. I-80125 Napoli Dipartimento di Ingegneria dei Materiali e della Produzione, Università di Napoli 'Federico II' Dipartimento di Ingegneria dei Materiali e della Produzione, p. le Tecchio 80, 80125, Napoli, Italy

    G. Luciani, A. Costantini & F. Branda

  2. Dipartimento di Ingegneria dei Materiali, Università di Trento, Via Mesiano 77, 38050, Trento, Italy

    P. Scardi

  3. Istituto Nazionale per la Fisica della Materia - INFM, Università di Napoli 'Federico II', p. le Tecchio 80, 80125, Napoly, Italy

    L. Lanotte

Authors
  1. G. Luciani
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  2. A. Costantini
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  3. F. Branda
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  4. P. Scardi
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  5. L. Lanotte
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Correspondence to G. Luciani.

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Luciani, G., Costantini, A., Branda, F. et al. Thermal evolution of ferromagnetic metallic glasses. Journal of Thermal Analysis and Calorimetry 72, 105–111 (2003). https://doi.org/10.1023/A:1023907417059

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