Issues »  Volume 37, Issue 2

Change of the Phase-Structural State of SmCo$_{5}$-Based Alloy During Solid-HDDR under Low Hydrogen Pressure

I. I. Bulyk$^{1}$, V. V. Burkhovetskyi$^{2}$, А. M. Trostianchyn$^{1}$

$^{1}$Karpenko Physico-Mechanical Institute, NAS of Ukraine, 5, Naukova Str., 79060 Lviv, Ukraine
$^{2}$Donetsk Institute for Physics and Engineering Named after O.O. Galkin, NAS of Ukraine, 72 R. Luxembourg Str., 83114 Donetsk, Ukraine

Received: 14.10.2013. Download: PDF

The change in phase-structural state of SmCo$_{5}$-based alloy during the hydrogenation, disproportionation, desorption, and recombination (HDDR) under hydrogen pressures of 0.5 MPa and 1.0 MPa in the temperature range 20—850°C with holding up to 5 h is investigated by means of the differential thermal and X-ray diffraction analyses and scanning electron microscopy methods. The dependence of phase composition on recombination temperature under solid-HDDR conditions is revealed. As found, the disproportionation reaction starts at the grain boundaries of SmCo$_{5}$ phase. For the first time, the possibility of finely dispersed structure formation by means of the HDDR in the case of partial disproportionation is established. As revealed under certain disproportionation conditions, the main phase residue is distributed throughout the bulk of alloy.

Key words: ferromagnetic alloy, SmCo$_{5}$, magnetic anisotropy, phase transformations initiated by hydrogen, hydrogen technologies.

URL: http://mfint.imp.kiev.ua/en/abstract/v37/i02/0169.html

DOI: https://doi.org/10.15407/mfint.37.02.0169

PACS: 61.05.cp, 61.66.Dk, 61.72.Ff, 64.60.Ej, 75.50.Tt, 81.07.Wx, 81.70.Pg

Citation: I. I. Bulyk, V. V. Burkhovetskyi, and А. M. Trostianchyn, Change of the Phase-Structural State of SmCo$_{5}$-Based Alloy During Solid-HDDR under Low Hydrogen Pressure, Metallofiz. Noveishie Tekhnol., 37, No. 2: 169—184 (2015) (in Ukrainian)

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