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Journal of Physical Studies 23(2), Article 2604 [5 pages] (2019)
DOI: https://doi.org/10.30970/jps.23.2604 A METHOD OF CHANGING PHYSICAL AND CHEMICAL CHARACTERISTICS OF BULK AMORPHOUS Fe-BASED ALLOYSO. M. Hertsyk{1}, T. H. Hula{1}, M. O. Kovbuz{1}, N. L. Pandiak{2}
{1}Ivan Franko National University of Lviv, |
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This paper investigates the changes in the properties of a bulk amorphous metallic alloy based on the ferrum (Fe$_{55}$Ni$_{8}$Co$_{6}$)$_{69}$-(Mo$_{4}$Cr$_{2}$V$_{1}$)$_{7}$-Al$_{2}$-(P$_{9}$C$_{6}$B$_{5}$Si$_{2}$)$_{22}$ under the influence of an alternating magnetic field (AMF). The level of the structural ordering of the bulk samples is higher than that of their tape counterparts. A slower cooling rate causes a partial nanocrystallization. The surface of such bulk samples is covered by surface layers, which were formed during the synthesis. These layers determine the corrosion resistance of amorphous alloys in the investigated solutions. After holding the samples in the AMF, some alteration of their elemental composition can be observed. An analysis of the electrochemical characteristics of the alloy samples under the conditions of cyclic scanning of the electrode potential indicates a higher corrosion resistance of the tested samples in a solution of hydrochloric acid. The lowest corrosion resistance was in the aqueous NaOH solution. During multiple cyclic polarization of bulk samples in aggressive media, a passivation of the surface occurs, and the destruction of the surface protective layers. The samples of the alloy (Fe$_{55}$Ni$_{8}$Co$_{6}$)$_{69}$-(Mo$_{4}$Cr$_{2}$V$_{1}$)$_{7}$-Al$_{2}$-(P$_{9}$C$_{6}$B$_{5}$Si$_{2}$)$_{22}$ modified by an alternating magnetic field have increased corrosion resistance in a 0.5 M aqueous solution of NaCl and HCl. By choosing the duration of the modification in the alternating magnetic field, it is possible to change the electrochemical parameters of the alloy (Fe$_{55}$Ni$_{8}$Co$_{6}$)$_{69}$-(Mo$_{4}$Cr$_{2}$V$_{1}$)$_{7}$-Al$_{2}$-(P$_{9}$C$_{6}$B$_{5}$Si$_{2}$)$_{22}$. An alternating magnetic field contributes to the diffusion of atoms in the bulk, which will determine not only the electrochemical parameters of amorphous alloys, but also other physical and chemical properties of a multicomponent sample. Under the influence of AMF, the electrical resistance of the amorphous samples is significantly reduced with increasing exposure to the magnetic field.
PACS number(s): 61.43.Dq, 75.50.Bb, 07.85.Tt, 07.85.Jy, 82.80.Fk, 82.45.Fk, 82.45.Bb, 81.40.Rs