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

Akihisa Inoue; Tao Zhang; Akira Takeuchi

doi:10.2320/matertrans1989.37.1731

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 journal › Article › peer-review

29 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 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 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<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.

Original language	English
Pages (from-to)	1731-1740
Number of pages	10
Journal	Materials Transactions, JIM
Volume	37
Issue number	12
DOIs	https://doi.org/10.2320/matertrans1989.37.1731
Publication status	Published - 1996 Dec
Externally published	Yes

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)

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10.2320/matertrans1989.37.1731

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title = "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 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.",

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",

author = "Akihisa Inoue and Tao Zhang and Akira Takeuchi",

year = "1996",

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AU - Inoue, Akihisa

AU - Zhang, Tao

AU - Takeuchi, Akira

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N2 - 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.

AB - 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.

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KW - High reduced glass transition temperature

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KW - Praseodymium-iron-aluminum alloy

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

Abstract

Keywords

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