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Effect of microstructure on the magnetic properties of mold-cast and melt-spun Nd-Fe-Co-Al amorphous alloys

✍ Scribed by G Kumar; J Eckert; S Roth; W Löser; L Schultz; S Ram

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
440 KB
Volume
51
Category
Article
ISSN
1359-6454

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✦ Synopsis

In this paper, we discuss the role of quenched-in crystallites and amorphous matrix for the large coercivity of Nd-Fe-Co-Al bulk cylinders. The present investigations of mold-cast and melt-spun Nd 60 Fe x Co 30 Ϫ x Al 10 (0ՅxՅ10) samples show that the Fe-rich as-cast (x ϭ 7.5, 10) bulk cylinders exhibit a partially crystalline structure, whereas the meltspun ribbons and Co-rich as-cast (xՅ5) bulk cylinders are amorphous. Spherulite-like regions consisting of Nd-rich and metastable (ϷNd 36 Fe 32 Co 28 Al 4 ) crystallites along with an amorphous matrix were observed in the as-cast Fe-rich bulk cylinders. The Co-rich ribbons and bulk cylinders with xՅ5 show a distinct endothermic peak in the DSC traces due to a glass transition in the range of 477-489 K. With further increasing Fe content the glass transition is masked by the crystallization. The effect of the Fe/Co ratio on the magnetic properties and the glass transition is discussed.

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