Microstructural mechanism on the improvement of the coercivity in 2:17-type samarium cobalt magnetic compound

J. B. Yang, Tetsuo Mori, K. Watanabe, K. Ishii

Research output: Contribution to journalArticle

Abstract

The cellular precipitation microstructure of 2:17-type magnetic compound was studied at various states of aging by transmission electron microscopy. It was shown that, the initial supersaturated solid solution phase (1175°C, 50 hours) exerts a great influence on the precipitation behavior in the subsequent isothermal aging process. When the supersaturated phase was a TbCu7-type disordered structure, it gives rise to a fine-scale continuous cellular precipitation microstructure which corresponds to a relatively high coercivity state. The cell interior is a Th2Zn17-type 2:17 phase which is separated by a thin continuous 1:5 boundary phase. On the other hand, when the supersaturated phase was Th2Zn17-type ordered structure, it only produces particle-like 1:5 phase precipitates along the large grain boundary of the Th2Zn17-type 2:17 phase, which corresponds to a very low coercivity state. An addition of copper stabilizes the TbCu7-type disordered phase, and therefore increases the coercivity.

Original languageEnglish
Pages (from-to)485-499
Number of pages15
JournalMemoirs of the Faculty of Engineering, Hokkaido University, Sapporo, Japan
Volume17
Issue number4
Publication statusPublished - 1989 Dec 1

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Microstructural mechanism on the improvement of the coercivity in 2:17-type samarium cobalt magnetic compound'. Together they form a unique fingerprint.

  • Cite this