Funct. Mater. 2021; 28 (3): 497-504.

doi:https://doi.org/10.15407/fm28.03.497

The influence of iron content on the phase-structural state of the alloy based on Sm2Co17 compound during hydrogen-vacuum treatment

A.Trostianchyn1,2, I.Bulyk2,3, Z.Duriagina1,4

1Lviv Polytechnic National University, 12 Bandrera St., 79013 Lviv, Ukraine
2Karpenko Physico-Mechanical Institute, National Academy of Sciences of Ukraine, 5 Naukova Str., 79060 Lviv, Ukraine
3Institute for Rare Earth Magnetic Materials and Devices (IREMMD), Jiangxi University of Science and Technology, 341000 Ganzhou, P.R. China
4The John Paul II Catholic University of Lublin, 14 Al. Raclawickie, 20-950 Lublin, Poland

Abstract: 

The influence of iron content in ferromagnetic alloys based on the Sm2Co17 compound on the changes in the phase composition and the balance of structural components during hydrogen-vacuum treatment has been studied by the methods of differential thermal analysis, X-ray phase analysis, and scanning electron microscopy. The alloys were treated by means of hydrogenation, disproportionation, desorption, and recombination (HDDR) under hydrogen pressures of 0.5, 2.0 and 4.0 MPa and a maximum heating temperature of 950°C. It is shown that hydrogen treatment of Sm2Co17-xFex alloys (x = 2, 4, 6, and 8) causes disproportionation of the ferromagnetic phase, while the phase composition of the interaction products depends on the Fe content in the initial alloy. It is found that vacuum heating of disproportionated alloys results in the recovery of the initial phase state in Sm2Co17-xFex alloys with x = 2, 4, and 6, while at x = 8 the disproportionation is irreversible. The microstructure of the recombined Sm2Co11Fe6 alloy is characterized by the formation of the FeCo fine inclusions with a size of 100-250 nm.

Keywords: 
permanent magnets, Sm-Co alloys, hydrogen treatment, phase transformations, microstructure refinement.

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