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Influence of production methods on structure and magnetic properties of NdFe11Ti based alloys and their nitrides


3rd International Conference on Magnetism and Magnetic Materials

October 22-23, 2018 | Rome, Italy

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

Posters & Accepted Abstracts: Res. Rev. J Mat. Sci

DOI: 10.4172/2321-6212-C6-030

Abstract

Compounds based on Fe and rare earth elements with the structural type ThMn12 have been known for more than 30 years and have fundamental magnetic properties comparable to the compound Nd2Fe14B. Nitrides of NdFe12 compound have higher properties than those of Nd2Fe14B compound: saturation magnetization 1.66 T, Curie temperature 550°C and anisotropy field 6.4 MA/m. However binary compounds RFe12 (R is rare-earth element) are stable only in the thin films forms. To stabilize this phases with ThMn12 structural type transition metals that replace Fe are used RFe12-xMx (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 NdFe11Ti 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 NdFe11Ti-NdFe11TiN 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 ThMn12. 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 NdFe11Ti 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. Recent Publications 1. Glezer А М, Timshin I A, Shchetinin I V et al. (2018) Unusual behavior of long-range order parameter in Fe3Al 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 Nd10.4Zr4.0Fe75.1Co4.1B6.4 after heat treatment. Journal of Alloys and Compounds DOI: 10.1016/j.jallcom.2017.01.002. 4. Menushenkov A P, Ivanov V G, 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.

E-mail: [email protected]

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