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THE EFFECT OF HEAT TREATMENT UNDER VARIOUS CONDITIONS ON MICROSTRUCTURE OF SINTERED (ND,PR,DY)-FE-B MAGNETS

1 KOSHKID’KO Yurij S.
Co-authors:
1 SKOTNICOVÁ Kateřina 1 KURSA Miroslav 1 ČEGAN Tomáš 2 BURKHANOV Gennadij S. 2 KOLCHUGINA Natalia B. 3 LUKIN A.A. 3 DORMIDONTOV A.G. 3 SITNOV V.V.
Institutions:
1 VSB - Technical University of Ostrava, Ostrava, Czech Republic, EU, Katerina.Skotnicova@vsb.cz
2 Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, , Moscow, Russian Federation, natalik@imet.ac.ru
3 “JSC SPETSMAGNIT”, Moscow, Russian Federation, lukinikul@rambler.ru
Conference:
23rd International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 21 - 23, 2014
Proceedings:
Proceedings 23rd International Conference on Metallurgy and Materials
Pages:
1369-1374
ISBN:
978-80-87294-52-9
ISSN:
2694-9296
Published:
18th June 2014
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
279 views / 166 downloads
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Abstract

The use powder mixtures, which consists of strip-casting (Nd,Pr)-Fe-B alloy and DyH2 hydride, allows the high-coercivity magnets to be prepared. The stability of the reached high magnetic characteristics in the course of both low- and high-temperature heat treatments was shown to be related to the evolution of grain structure of the magnets. The microstructure and chemical composition of the permanent magnets were studied by electron microscopy (SEM/EDX) using a Quanta 450 FEG microscope. Electron microscopic studies of their microstructure demonstrated annealing-induced changes in the thickness and continuity of (Nd,Pr,Dy)2Fe14B-phase grain boundaries and the shape of triple junctions of the grains. Electron microprobe analysis of triple junctions revealed the presence of various (Nd,Pr,Dy)-O oxides such as (Nd,Pr,Dy)O, (Nd,Pr,Dy)2O3 and (Nd,Pr,Dy)O2. The studies performed allow us to conclude the effect of heat treatment of the principal structural and magnetic characteristics of permanent magnets.

Keywords: Permanent magnets, strip casting, grain boundaries

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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