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


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Article Info

DATE

2018-04

AUTHORS

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

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. More... »

PAGES

354-358

References to SciGraph publications

  • 2000-08. Programs for X-ray analysis of polycrystals in METAL SCIENCE AND HEAT TREATMENT
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1134/s0036029518040134

    DOI

    http://dx.doi.org/10.1134/s0036029518040134

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