Nanocrystalline powders of Fe81Si9B6Nb3Cu1 composition have been synthesised by high-energy ball milling and characterised by means of X-ray and neutron diffraction, Mossbauer spectroscopy and magnetic tests. The diffraction and Mossbauer measurements point out the progressive formation of a bcc alpha-Fe(Si, Nb, Cu, B) disordered solid solution with average particle size in the nanometre range. In addition, for the specimens mechanically treated for prolonged times, the Mossbauer spectra show an ultrafine non-stoichiometric Fe3+xSi1-x crystalline phase. The coercive field of the powder after long milling time is higher than that of the partially crystallized metallic glass of similar composition. The annealing at 973 K in inert atmosphere of the samples mechanically alloyed for long times mainly produces the Fe3Si crystalline phase and small amounts of borides and Fe-Nb aggregates.
Structural and magnetic properties of mechanically alloyed Fe81Si9B6Nb3Cu1 powders / Gupta, R; Enzo, Stefano; Frattini, R; Hernando, A; Marin, P; Mulas, Gabriele Raimondo Celestino Ettore; Perin, A; Principi, G.. - In: INTERNATIONAL JOURNAL OF NON-EQUILIBRIUM PROCESSING. - ISSN 1368-9290. - 10:3-4(1998), pp. 283-296.
Structural and magnetic properties of mechanically alloyed Fe81Si9B6Nb3Cu1 powders
ENZO, Stefano;MULAS, Gabriele Raimondo Celestino Ettore;
1998-01-01
Abstract
Nanocrystalline powders of Fe81Si9B6Nb3Cu1 composition have been synthesised by high-energy ball milling and characterised by means of X-ray and neutron diffraction, Mossbauer spectroscopy and magnetic tests. The diffraction and Mossbauer measurements point out the progressive formation of a bcc alpha-Fe(Si, Nb, Cu, B) disordered solid solution with average particle size in the nanometre range. In addition, for the specimens mechanically treated for prolonged times, the Mossbauer spectra show an ultrafine non-stoichiometric Fe3+xSi1-x crystalline phase. The coercive field of the powder after long milling time is higher than that of the partially crystallized metallic glass of similar composition. The annealing at 973 K in inert atmosphere of the samples mechanically alloyed for long times mainly produces the Fe3Si crystalline phase and small amounts of borides and Fe-Nb aggregates.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
