Effect of Co addition on the magnetic properties of nanocrystalline Fe-rich Fe-Nb-(Nd,Pr)-B alloys produced by crystallization of an amorphous phase

Akinori Kojima, Akihiro Makino, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The effect of Co addition on the magnetic properties and microstructure for the nanocrystalline Fe93-xNb2(Nd,Pr)2B2 (x = 5-7) alloys produced by crystallization of an amorphous phase has been investigated. The melt-spun Fe93-x-yCoxNb2(Nd,Pr)y B5 (x = 0-20 and y = 5-7 at.%) ribbons form a nanocomposite structure of bcc-(Fe,Co) and Pr2(Fe,Co)14B with grain sizes of 10-50 nm after annealing at 973-1023 K, showing a smooth J-H curve typical for the exchange-spring magnet. The alloys containing Co show a high energy product ((BH)max) upon annealing at a relatively low temperature presumably because the precipitation temperature of each phase decreases by addition of CO. The (BH)max values after annealing at an optimum temperature are improved by addition of 5-20 at.% Co for the Fe86-xCoxNb2(Nd,Pr)7B5 and Fe88-xCoxNb2Nd5B5 alloys. The improvement of (BH)max by Co addition is attributed to the enhancement of Jr, presumably resulting from the increase in magnetization of each phase and the exchange-coupled region between the soft and hard magnetic phases.

Original languageEnglish
Pages (from-to)1383-1387
Number of pages5
JournalScripta Materialia
Volume44
Issue number8-9
DOIs
Publication statusPublished - 2001 May 18
Externally publishedYes

Keywords

  • Amorphous
  • Crystallization
  • Magnetic properties
  • Nanocomposite magnet
  • Remanence enhancement

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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