Soft magnetic properties of bulk nanocrystalline Fea0Zr7B3 alloys consolidated by spark-plasma sintering

Akinori Kojima, Takao Mizushima, Akihiro Makino, Akihisa Inoue, Tsuyoshi Masumoto

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Nanocrystalline bulk Fe90Zr7B3 alloys with grain sizes of 20 to 30 nm were prepared by spark-plasma sintering of amorphous powders and subsequent annealing. The bulk alloys sintered at the temperature (Ts) between 673 and 723 K are composed of a mostly single amorphous phase and the alloy sintered at Ts of 873 K is composed of a mostly single bcc-Fe phase in as-sintered state. The former alloys show better soft magnetic properties in spite of porous consolidated state than the latter alloy after annealing at 923 K. For the bulk alloy sintered at Ts of 723 K, the effective permeability (μc) increases by accelerating the heating rate (α) in sintering and the density becomes higher by increasing the sintering pressure (Ps). The nanocrystalline alloy sintered at Ts of 723 K, Ps of 780 MPa and α of 1.7 K/s shows the maximum permeability of 29800, effective permeability of 3430 at 100 Hz and coercivity of 12 A/m with a relative density of 97 %.

Original languageEnglish
Pages (from-to)613-618
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number5
Publication statusPublished - 1996 May


  • Amorphous
  • Consolidation
  • Nanocrystalline alloy
  • Soft magnetic properties
  • Spark-plasma sintering

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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