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Glass-forming ability and thermal stability of Nd70−xFe20Al10Yx alloys

✍ Scribed by K.Q. Qiu; H.F. Zhang; A.M. Wang; B.Z. Ding; Z.Q. Hu

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 190 KB
Volume: 50
Category: Article
ISSN: 1359-6454
DOI: 10.1016/s1359-6454(02)00156-8

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✦ Synopsis

The glass-forming ability (GFA) and thermal stability of Nd 70Ϫx Fe 20 Al 10 Y x (0ՅxՅ15) alloys produced by melt spinning and copper-mold casting have been investigated. Ribbon samples in the composition range show a fully amorphous structure. Except Y=5 at.%, bulk amorphous alloys at least 2 mm in diameter were obtained. Both the amorphous ribbon and the bulk cylinder for the Nd 55 Fe 20 Al 10 Y 15 alloy show a distinct glass transition temperature and a wide supercooled liquid region before crystallization. It is suggested to use a new parameter to characterize both the GFA and the thermal stability of Nd-Fe-Al-Y alloys, showing that Nd 60 Fe 20 Al 10 Y 10 alloy is the best one both in GFA and thermal stability. The remanence (J r ), magnetization (J 1500 ), and coercivity (H c ) for the as-cast Nd 70Ϫx Fe 20 Al 10 Y x amorphous cylinders depend strongly on the composition. The enhanced GFA and thermal stability as well as the reduction of magnetic properties are discussed.

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