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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
Influence of production methods on structure and magnetic properties of NdFe
11
Ti based alloys and
their nitrides
Igor V Shchetinin, Mark V M V Zheleznyi, Mikhail V Gorshenkov, Andrey I Bazlov, Anton V Kamynin
and
Alexander G Savchenko
National University of Science and Technology “MISiS”, Russia
C
ompounds based on Fe and rare earth elements with the structural type ThMn
12
have been known for more than 30 years
and have fundamental magnetic properties comparable to the compound Nd
2
Fe
14
B. Nitrides of NdFe
12
compound have
higher properties than those of Nd
2
Fe
14
B compound: saturation magnetization 1.66 T, Curie temperature 550°C and anisotropy
field 6.4 MA/m. However binary compounds RFe
12
(R is rare-earth element) are stable only in the thin films forms. To stabilize
this phases with ThMn
12
structural type transition metals that replace Fe are used RFe
12-x
M
x
(where M = Al, Cr, V, Ti, Mo, W,
Si or Nb) At present time these alloys have no practical application due to small values of hysteresis properties compared to
the Nd-Fe-B system. In this regard, investigation of structure formation and magnetic properties of NdFe
11
Ti alloys quenched
from the liquid state and subjected to heat treatment is an urgent task. As a result of these studies, methods and regimes for
producing of NdFe
11
Ti-NdFe
11
TiN compounds have been tested: melting, homogenizing annealing, quenching from a liquid
state, and nitriding. It is shown that homogenizing annealing at a temperature of 1100°C for 168 h makes it possible to obtain
a ferromagnetic phase with a structural type of ThMn
12
. An almost single-phase state (97%) was produced by quenching from
the liquid state without using prolonged annealing which increases the grain size of the NdFe
11
Ti phase to about 150 nm.
It is shown that nitriding of the alloy leads to an increase in main magnetic hysteresis properties. The maximum magnetic
hysteresis properties were obtained using a combination of quenching methods from the liquid state and nitriding: Hc = 1053
Oe, σr = 46 emu/g, σs = 139 emu/g.
Figure1:
The results of transmission electron microscopy of samples after quenching from the liquid state.
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 TM, 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 DOI:
10.1016/j.jallcom.2017.01.002.
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