Preparation of bulk Pr-Fe-Al amorphous alloys and characterization of their hard magnetic properties

Akihisa Inoue, Tao Zhang, Akira Takeuchi

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)

Abstract

The amorphous phase in the Pr-Fe-Al system is formed in an extremely wide composition range of 0 to 90 at% Fe and 0 to 93 at% Al by melt spinning. Ferromagnetic Pr90-xFexAl10 bulk amorphous alloys with high coercive force at room temperature are obtained by a copper mold casting method. The maximum diameter of the cylindrical amorphous samples with a length of 50 mm is 3 mm for the 30%Fe alloy and 1 mm for the 20%Fe, 40%Fe and 50%Fe alloys. Neither the glass transition nor the supercooled liquid region is observed in the temperature range before crystallization (T<Tx), which is different from other bulk amorphous alloys exhibiting wide supercooled liquid regions. The extremely high Tx/Tm and small ΔTm(=Tm-Tx) values are the reason for the achievement of large glass-forming ability in this system. The bulk amorphous Pr60Fe30Al10 alloy is ferromagnetic with the Curie temperature (Tc) of 515 K which is higher than the highest Tc of 470 K for Pr-Fe binary amorphous ribbons. The remanence (Br) and intrinsic coercive force (iHc) are 0.089 T and 300 kA/m, respectively, and the crystallization to Pr+Al2Pr+δ phases causes a ferromagnetic-to-paramagnetic phase transition. Thus, the hard magnetic properties are achieved only in the amorphous state.

Original languageEnglish
Pages (from-to)1731-1740
Number of pages10
JournalMaterials Transactions, JIM
Volume37
Issue number12
DOIs
Publication statusPublished - 1996 Dec

Keywords

  • Bulk amorphous permanent magnet
  • Copper mold casting
  • Ferromagnetic bulk amorphous alloy
  • Ferromagnetic cluster
  • High coercive force
  • High reduced glass transition temperature
  • Large glass-forming ability
  • Praseodymium-iron-aluminum alloy

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Preparation of bulk Pr-Fe-Al amorphous alloys and characterization of their hard magnetic properties'. Together they form a unique fingerprint.

Cite this