Features of Nanocrystallization of Metallic Glass Fe_<78>B_<13>Si_9 Induced by High-Current-Density Electropulsing

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The microstructure of the nanocrystalline Fe_<78>B_<13>Si_9 alloy, prepared by means of high-current-density electropulsing from the parent amorphous alloy (2605S-2), has been investigated by Mossbauer spectroscopy along with X-ray diffraction and transmission electron microscoopy. The experimental results show that nanocrystalline Fe_<78>B_<13>Si_9 alloy is uniformly composed of the grains about 23 nm in diameter, with an interfacial component. Two crystalline phases are a disordered α-Fe(Si) solid solution with an Si concentration of 11.3 at.% and t-Fe_2B. The interface phase is ferromagnetic Fe_<6.7>B_<4.1>Si_<2.2> with large number of voids, and is estimated to be about 1.3 nm thick with four to five atomic layers. The examination of a comparable isothermally annealed amorphous Fe_<78>B_<13>Si_9 sample reveals that the crystalline of the amorphous Fe_<78>B_<13>Si_9 alloy and its ultrafine grain structure should be attributed mainly to the electromagnetic effect from high-current-density electropulsing. The mechanism involved is discussed.
社団法人応用物理学会の論文
1996-10-15