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A comparative study of mechanical alloying and mechanical milling of Nd8Fe88B4

  • Q. Zeng
  • Y. F. Xiao
  • X. B. Liu
  • S. Z. Dong
  • Y. S. Deng
  • Z. Y. Zhang
  • R. Wang
Article

Abstract

A comparative study was made of structure and magnetic properties of Nd8Fe88B4 prepared by mechanical alloying (MA) using elemental powders as starting materials and by mechanical milling (MM) of the alloy. X-ray diffraction (XRD) and differential scanning calorimetry (DSC) combined with transmission electron microscopic (TEM) studies revealed that both milling procedures resulted in a mixture of α-Fe and an amorphous phase. The thermal stability of the as-milled powders produced by MA was comparable to that of the as-milled powders produced by MM. Heat treatment of the milled powders above the crystallization temperature resulted in the formation of a nanocrystalline mixture of Nd2Fe14B and α-Fe, but annealed MA powders demonstrated a somewhat coarser structure in comparison with annealed MM powders. Therefore, higher remanences and coercivities were obtained by MM.

Keywords

mechanical alloying mechanical milling nanocrystalline materials Nd-Fe-B alloys permanent magnets 

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Copyright information

© ASM International 1999

Authors and Affiliations

  • Q. Zeng
    • 1
  • Y. F. Xiao
    • 2
  • X. B. Liu
    • 2
  • S. Z. Dong
    • 2
  • Y. S. Deng
    • 2
  • Z. Y. Zhang
    • 2
  • R. Wang
    • 2
  1. 1.Beijing Institute of Aeronautical MaterialsBeijingChina
  2. 2.Institute of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingChina

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