Influence of the particle shape on microstructure and magnetic properties of iron powder cores

Takuya Takashita, Naomichi Nakamura, Yukiko Ozaki

Research output: Contribution to journalArticle

Abstract

The coercive force of an iron powder core decreases with an increase in the circularity of raw iron powder. Microstructural observation reveals that the crystal grain size of the iron powder core is reduced through recrystallization during the stress relief annealing after the powder compaction. An analysis of the work hardening behavior through the compaction process shows that a rounder particle shape leads to a smaller particle deformation, resulting in a reduction of the crystal grain refinement through recrystallization. A grain boundary pinning model well describes the reduction of coercive force with the increase in the eventual grain size.

Original languageEnglish
Pages (from-to)315-323
Number of pages9
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume79
Issue number6
DOIs
Publication statusPublished - Jun 1 2015

Fingerprint

Iron powder
Magnetic properties
magnetic properties
Coercive force
iron
microstructure
Microstructure
Compaction
Stress relief
Crystals
grain size
Grain refinement
Strain hardening
Powders
work hardening
Grain boundaries
Crystallization
Annealing
crystals
grain boundaries

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

Cite this

Influence of the particle shape on microstructure and magnetic properties of iron powder cores. / Takashita, Takuya; Nakamura, Naomichi; Ozaki, Yukiko.

In: Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals, Vol. 79, No. 6, 01.06.2015, p. 315-323.

Research output: Contribution to journalArticle

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