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Glass-forming Ability and Magnetic Properties of Nd70−xFe20Al10Cox Alloys

Published online by Cambridge University Press:  31 January 2011

G. J. Fan ,
W. Löser ,
S. Roth ,
J. Eckert  and
L. Schultz
G. J. Fan
Affiliation:
Institut für Festkörper- und Werkstoffurschung, Dresden, Institut für Metallische Werkstoffe, Dresden, Germany
W. Löser
Affiliation:
Institut für Festkörper- und Werkstoffurschung, Dresden, Institut für Metallische Werkstoffe, Dresden, Germany
S. Roth
Affiliation:
Institut für Festkörper- und Werkstoffurschung, Dresden, Institut für Metallische Werkstoffe, Dresden, Germany
J. Eckert
Affiliation:
Institut für Festkörper- und Werkstoffurschung, Dresden, Institut für Metallische Werkstoffe, Dresden, Germany
L. Schultz
Affiliation:
Institut für Festkörper- und Werkstoffurschung, Dresden, Institut für Metallische Werkstoffe, Dresden, Germany
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Abstract

The influence of Co addition on the glass-forming ability of slowly cooled Nd70-xFe20Al10Cox alloys (0 ≤ x ≤ 10) was studied by x-ray diffraction, constant-rate heating calorimetry, and magnetic measurements. Without addition of Co, the as-cast Nd70Fe20Al10 cylinders of 3-mm diameter show a mixture of amorphous and crystalline phases after copper mold casting. Increasing the Co content promotes amorphization, and bulk amorphous specimens can be obtained for Nd60Fe20Al10Co10. No glass transition or supercooled liquid region before crystallization was observed for the bulk Nd60Fe20Al10Co10 alloy. The bulk amorphous alloy exhibits hard magnetic behavior with a remanence (Jr) of 0.09 T, a magnetization (J1500) of 0.13 T, and a coercivity (Hc) of 298 kAm−1. The Curie temperature for the as-cast Nd70-xFe20Al10Cox cylinders increases from 480 K for x =0 to 487 K for x = 10. The enhanced glass-forming ability for the Nd–Fe–Al-based alloys upon Co addition will be critically discussed with respect to classical nucleation theory and the formation of metastable ordered clusters upon solidification.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 7 , July 2000 , pp. 1556 - 1563
Copyright
Copyright © Materials Research Society 2000

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