Preparation of Bulk Pr–Fe–Al Amorphous Alloys and Characterization of Their Hard Magnetic Properties

• Inoue Akihisa

  Institute for Materials Research, Tohoku University

• Zhang Tao

  Institute for Materials Research, Tohoku University

• Takeuchi Akira

  Institute for Materials Research, Tohoku University

Bibliographic Information

Other Title

• Preparation of Bulk Pr Fe Al Amorphous
• Preparation of Bulk Pr–Fe–Al Amorphous Alloys and Characterization of Their Hard Magnetic Properties

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 Pr_90−xFe_xAl₁₀ bulk amorphous alloys with high coercive force at room temperature are obtained by a copper mold casting method. The maximum diameter of the cylindrical amorphoussamples with a length of 50 mm is 3 mm for the 30%Fe alloy and 1 mm for the 20%Fe, 40%hFe and 50%hFe alloys. Neither the glass transition nor the supercooled liquid region is observed in the temperature range before crystallization (T<T_x), which is different from other bulk amorphous alloys exhibiting wide supercooled liquid regions. The extremely high T_x⁄T_m and small ΔT_m(=T_m−T_x) 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 (T_c) of 515 K which is higher than the highest T_c of 470 K for Pr–Fe binary amorphous ribbons. The remanence (B_r) and intrinsic coercive force (_iH_c) 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.

Journal

• Materials Transactions, JIM

  Materials Transactions, JIM 37 (12), 1731-1740, 1996

  The Japan Institute of Metals

Keywords

• bulk amorphous permanent magnet
• ferromagnetic bulk amorphous alloy
• praseodymium-iron-aluminum alloy
• copper mold casting
• large glass-forming ability
• high reduced glass transition temperature
• high coercive force
• ferromagnetic cluster
• relaxation-induced cluster
• random magnetic anisotropy

Details

• CRID: 1390282679223164160
• NII Article ID: 130003556617
• NII Article ID: 10002451163
• NII Book ID: AA10699969
• DOI: 10.2320/matertrans1989.37.1731
• COI: 1:CAS:528:DyaK2sXhtlOntL8%3D
• ISSN: 2432471X
• ISSN: 09161821
• NDL BIB ID: 4121888
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4121888
• Web Site: https://www.jstage.jst.go.jp/article/matertrans1989/37/12/37_12_1731/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed