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conferenceseries
.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Magnetic Materials 2018
October 22-23, 2018
October 22-23, 2018 | Rome, Italy
3
rd
International Conference on
Magnetism and Magnetic Materials
Structure and magnetic properties of alloys based on SmFe
17
nitride after serve plastic deformation
by torsion
Igor V Shchetinin
1
, Vladimir P Menushenkov
1
, Roman V Sundeev
2
and
Alexander G Savchenko
1
1
National University of Science and Technology “MISiS”, Russia
2
Moscow Technological University, Russia
T
he nitrides of the Sm
2
Fe
17
-based alloys are promising for the development of permanent magnets because they have a
high magnetic crystalline anisotropy constant, Curie temperature, and are cheaper than compounds like Nd
2
Fe
14
B. In
this connection, study of structure formation and magnetic properties of alloys based on nitrides of the Sm
2
Fe
17
compound
obtained by the methods of extreme effects is the actual task. It this work, we show that alloys in the initial state and after
the hydrogenation and dehydrogenation processes contained the main phase of Sm
2
Fe
17
and a small amount (<2%) of α-Fe
nitriding resulted in increased of Sm
2
Fe
17
lattice spacing without formation of new phases. After severe plastic deformation
by torsion (SPDT), diffraction patterns of the alloys revealed a strong broadening of the diffraction lines which indicated the
formation of a dispersed structure and was confirmed by SEM data: the formation of an equiaxial structure in the sample with
an average grain size of 20 nm. In addition, according to X-ray diffraction analysis, the fraction of α-Fe increased in the SPDT
process due to the local heating of the sample and leads to decomposition of Sm
2
Fe
17
N
2.8
phase. The hysteretic properties of the
alloys changed in an extreme: under deformations with n = 2.5, the coercive force was increased to 6.5 kOe, and an increase
in the degree of deformation led to a decrease in the coercive force, with the formation of a characteristic loop of magnetic
hysteresis. As a result of the deformation at 77 K, nitride decomposition was not observed which confirms the heating of the
material during deformation at room temperature.
Recent Publications
1. Glezer А М, Timshin I A, Shchetinin I V, et al. (2018) Unusual behavior of long-range order parameter in Fe
3
Al
superstructure under severe plastic deformation in Bridgman anvils. Journal of Alloys and Compounds DOI:
10.1016/j.jallcom.2018.02.124.
2. Romankov S, Park Y C and Shchetinin I V (2018) Structural transformations in (CoFeNi)/Ti nanocomposite systems
during prolonged heating. Journal of Alloys and Compounds 745:44–54.
3. Savchenko A G, Medvedeva T M, Shchetinin I V, et al. (2017) Phase-structural state diagrams and hysteresis
properties of rapidly solidified alloy Nd
10.4
Zr
4.0
Fe
75.1
Co
4.1
B
6.4
after heat treatment. Journal of Alloys and Compounds
707(2017):20–209.
4. Menushenkov A P, Ivanov VG, Shchetinin I V, et al. (2017) XMCD study of the local magnetic and structural properties
of microcrystalline NdFeB-based alloys. JETP Letters 105(1):38–42.
Biography
Igor V Shchetinin has completed his PhD in the year 2012 from National University of Science and Technology. He is the head of X-ray structure analysis and
diagnostic of materials laboratory. He has published more than 60 papers in reputed journals and has been serving as an Editorial Board Member of repute.
ingvar@misis.ruIgor V Shchetinin et al., Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C6-030