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Bulk metallic glass formation, composite, and magnetic propertiesof Fe-B-Nd based alloys

Published online by Cambridge University Press:  31 January 2011

J. Zhang ,
Y.P. Feng  and
Y. Li
Y.P. Feng
Affiliation:
Department of Physics, National University of Singapore, 117542, Singapore
Y. Li*
Affiliation:
Department of Materials Science & Engineering, National University of Singapore, 119260, Singapore
*
a) Address all correspondence to this author.e-mail: [email protected]
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Abstract

The glass formation in Fe-rich ternary Fe-B-Nd and quaternary (Fe,B,Nd)96Nb4 alloys has been studied and the best ternary and quaternary glass formers are located at Fe67B23Nd10 and (Fe68B25Nd7)Nb4 with critical diameters of 1 and 4 mm, respectively. For (Fe,B,Nd)96Nb4 alloys, the competing phases with glass were identified by monitoring the microstructure change. Fe14Nd2B was discovered to be one competing phase, which is the principle magnetic phase for Nd-Fe-B hard magnets. Composites with uniformly distributed Fe14Nd2B were formed for quaternary alloys with a diameter of 1.5 to 3 mm. Bulk hard magnets could be obtained by directly annealing the composites in a compositional area. A hard magnet with a coercivity of 1,100 kAm−1 and a maximum energy product, (BH)max, of 33 kJm–3 was obtained at (Fe67B23Nd10)96Nb4 by annealing. The combination of hard magnetic properties and the large critical sample size may make these alloys a commercially viable candidate for industrial applications.

Keywords

AmorphousCompositeMagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 2 , February 2009 , pp. 357 - 371
Copyright
Copyright © Materials Research Society 2009

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