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Phase Composition and Magnetic Properties of Nd2Fe14B/α-Fe Nanocomposites Prepared by Mechanical Alloying

  • Advanced Materials and Technologies
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Russian Metallurgy (Metally) Aims and scope

Abstract

Combined studies of hard magnetic Nd2Fe14B/α-Fe nanocomposites are performed. They were prepared by mechanical alloying of melt-quenched Nd7.4Pr2.0Fe76.6Co4.2Zr3.4B6.4 and Nd5.8Fe80Co4.9Ti1.5Si2.5B5.3 alloys taken in mass proportions of 90/10 and 70/30. It is found that, after mechanical alloying, an amorphous–crystalline structure is formed; it consists of the hard magnetic Nd2Fe14B and soft magnetic (amorphous and α-Fe) phases. Subsequent annealing at ~500°C initiates the decomposition of the amorphous phase and the formation of the nanocrystalline Nd2Fe14B and α-Fe phases. This leads to an increase in the coercivity and the residual magnetization-to-saturation magnetization ratio (σr/σs ≥ 0.5). It is assumed that the magnetic hardening of powders is due to the formation of an exchange-coupled state, which results from the exchange interaction between α-Fe nanocrystals and the Nd2Fe14B phase.

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Authors and Affiliations

  1. National University of Science and Technology MISiS, Moscow, 119049, Russia

    A. G. Savchenko, V. P. Menushenkov, I. V. Shchetinin, A. I. Rafal’skii & I. G. Bordyuzhin

  2. ZAO Assotsiatsiya Aerokosmicheskikh Inzhenerov, Korolev, Moscow oblast, 141075, Russia

    A. Yu. Plastinin

  3. OOO NPO Global Magnetic, Korolev, Moscow oblast, 141076, Russia

    V. A. Ryazantsev

  4. Moscow State University, Moscow, 119991, Russia

    V. N. Verbetskii

Authors
  1. A. G. Savchenko
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  2. V. P. Menushenkov
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  3. A. Yu. Plastinin
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  4. I. V. Shchetinin
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  5. A. I. Rafal’skii
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  6. I. G. Bordyuzhin
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  7. V. A. Ryazantsev
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  8. V. N. Verbetskii
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Corresponding author

Correspondence to V. P. Menushenkov.

Additional information

Original Russian Text © A.G. Savchenko, V.P. Menushenkov, A.Yu. Plastinin, I.V. Shchetinin, A.I. Rafal’skii, I.G. Bordyuzhin, V.A. Ryazantsev, V.N. Verbetskii, 2017, published in Deformatsiya i Razrushenie Materialov, 2017, No. 10, pp. 30–34.

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Savchenko, A.G., Menushenkov, V.P., Plastinin, A.Y. et al. Phase Composition and Magnetic Properties of Nd2Fe14B/α-Fe Nanocomposites Prepared by Mechanical Alloying. Russ. Metall. 2018, 354–358 (2018). https://doi.org/10.1134/S0036029518040134

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  • DOI: https://doi.org/10.1134/S0036029518040134

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