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STRUCTURE AND MAGNETIC PROPERTIES OF ND-FE-B ALLOYS WITH CU ADDITIONS, OBTAINED BY MECHANICAL SYNTHESIS

1 panov Kirill
Co-authors:
1 Shchetinin Igor 1 Bordyuzhin Igor 1 Menushenkov Vladimir 1 Dorofievich Irina
Institution:
1 National University of Science and Technology “MISiS” (NUST “MISiS”), Moscow, Russia, ingvvar@gmail.com
Conference:
29th International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 20 - 22, 2020
Proceedings:
Proceedings 29th International Conference on Metallurgy and Materials
Pages:
1073-1079
ISBN:
978-80-87294-97-0
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2020.3610
Published:
27th July 2020
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
604 views / 394 downloads
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Abstract

In this work the phase transformations in Nd-Fe-B alloys with copper additives obtained by mechanochemical synthesis (MS) was studied. After MS process a partial decomposition of the Nd2Fe14B crystalline phase into the amorphous phase and α-Fe occurs with a maximum ratio of 20 and 8%, respectively. According to SEM data, the particle size was 1 μm with a substructure. The heat treatment of Nd-Fe-B alloys with Cu additives leads to crystallization of the amorphous phase and an increase in coercive force and residual magnetization. The maximum hysteresis properties were achieved for the sample with the addition of 0.4% Cu: Hc = 376 kA / m and σr = 65 A·m2/kg. It was shown that an increase in coercive force is associated with the presence of a mechanism for pinning of domain walls.

Keywords: Nd-Fe-B, mechanical synthesis, XRD, magnetic properties, grain boundaries

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