Refinement of the microstructure and enhancement of the magnetic properties in alpha-Fe/(Nd,DY)(2)Fe14B annealing nanocomposite using the two-step technique

Wei Chen, X. Zhao, J.J. Hu, A.J. Li, Y. Tian, G.D. Tang, R.W. Gao, M.G. Zhu, X.M. Li, W. Li

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The Nd8-xDyxFe87.5B4.5 (x = 0- 1.0) nanocomposites have been prepared by melt spinning and subsequent two-step heat treatment technique. The crystallization behaviors, microstructures and magnetic properties of the samples have been investigated. The experimental results show that the crystallization temperature of alpha-Fe soft phase has no obvious change through Dy addition while the crystallization temperature of 2:14:1 hard phase increases remarkably with increasing Dy content. By adopting a two-step heat treatment technique, a finer and more uniform microstructure can be developed. A dramatic enhancement of remanence J(r) from 0.84 to 1.1 T, coercivity H-cj from 417 to 520 kA/m and energy product (BH)(m) from 76.8 to 110 kJ/m(3) have been obtained in Nd7Dy1Fe87.5B4.5 (30 vol%alpha-Fe) nanocomposite.
Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Issue number1
Pages (from-to)51-54
Publication statusPublished - 2006


  • exchange interaction
  • grain refining
  • magnetic properties
  • nanocomposite
  • annealing

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