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  • 1 Departamento de Física, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil
  • | 2 Departamento de Química Fundamental, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil
  • | 3 Graduate Program in Material Science, Universidade Federal de Pernambuco, Recife, PE, 50670-901, Brazil
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Abstract

Magnetic thermogravimetric analysis (TGM) was used to investigate the influence of the milling time (tmill) in the Curie temperature (TC) of nanocrystalline powders and of a melt-spun amorphous ribbon with composition Fe56Co7Ni7Zr10B20. The TGM analysis was carried in a continuous flow of 99.99% pure argon from room temperature up to 1250 K. A magnetic field of 100 Oe was applied throughout the measurements. Nanopowders of Fe56Co7Ni7Zr10B20 were produced by mechanical alloying the samples in an argon atmosphere for milling times ranging from 1 to 100 h. The samples were characterized by X-ray diffraction and by scanning electron microscopy. The average particle size decreased from 45.4 nm for a powder milled for 1 h to 5 nm after being milled for 100 h. Moreover, TC (=1126.4 ± 4.4 K) was found to be nearly independent of tmill while for the melt-spun amorphous ribbon it was found to be substantially smaller (TC = 482 K). This is a clear indication that TC is quite sensitive to the degree of amorphosity present in the sample. The activation energy associated to the crystallization process was estimated from DSC data by using the Kissinger's method to be 193 kJ/mol.

  • 1. Suryanarayana, C 2001 Mechanical alloying and milling. Prog Mater Sci 46:1184 .

  • 2. Tanaka, S, Diao, Z, Sugimoto, T, Narita, K 1992 Solid amorphization of Fe- and Co-based alloys and their magnetic properties. J Magn Magn Mater 112:302304 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 3. Sharma, S, Vaidyanathan, R, Suryanarayana, C 2007 Criterion for predicting the glass ability of alloys. Appl Phys Lett 90:3111915.

  • 4. Bhatt, J, Murty, BS 2008 On the conditions for the synthesis of bulk metallic glasses by mechanical alloying. J Alloys Compd 459:135141 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 5. Liu, YJ, Chang, ITH 2002 The correlation of microstructural development and thermal stability of mechanically alloyed multicomponent Fe–Co–Ni–Zr–B alloys. Acta Mater 50:27472760 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 6. Gallagher, PK 1997 Thermomagnetometry. J Therm Anal Calorim 49:3344 .

  • 7. Leu, MS, Tung, IC, Chin, TS 1998 Elevated temperature initial permeability study of some ferromagnetic alloys. Mater Chem Phys 57:117124 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 8. Liu, T, Chen, N, Xu, ZX, Ma, RZ 1996 The amorphous-to-nanocrystalline transformation in Fe73.5Cu1Nb3Si13.5B9 studied by thermogravimetry analysis. J Magn Magn Mater 152:359364 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 9. González, A, Bonastre, J, Escoda, L, Suñol, JJ 2007 Thermal analysis of Fe(Co, Ni) based alloys prepared by mechanical alloying. J Therm Anal Calorim 87:255258 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 10. Luciani, G, Constantini, A, Branda, F, Ausanio, G, Hison, C, Iannoti, V, Luponio, C, Lanotte, L 2004 Modified thermogravimetric apparatus to measure magnetic susceptibility on-line during annealing of metastable ferromagnetic materials. J Magn Magn Mater 272–276:23102311 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 11. Cullity, BD 1956 Elements of X-ray diffraction 1 Addinson Wesley Massachussetts.

  • 12. Williamson, GK, Hall, WH 1953 X-ray line broadening from aluminium and wolfram. Acta Metall 1:2231 .

  • 13. Coey, JMD 2009 Magnetism and magnetic materials 2 Cambridge University Press Cambridge.

  • 14. Legendre B , Sghaier M. Curie temperature of nickel. J Therm Anal Calorim. 2011. doi: .

  • 15. Inoue, A, Zhang, T, Koshiba, H 1998 New bulk amorphous Fe–(Co, Ni)–M–B (M = Zr, Hf, Nb, Ta, Mo, W) alloys with good soft magnetic materials properties. J Appl Phys 83:63266328 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 16. McHenry, ME, Willard, MA, Laughlin, DE 1999 Amorphous and nanocrystalline materials for applications as soft magnets. Prog Mater Sci 44:291433 .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 17. Kissinger, HE 1957 Reaction kinetics in differential thermal analysis. Anal Chem 29:17021706 .

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