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Crystallization of amorphous melt-spun Nd15Fe77Bx (x = 6–14) alloys

Published online by Cambridge University Press:  03 March 2011

T. Harada  and
T. Kuji
T. Harada
Affiliation:
Corporate R & D Center, Mitsui Mining & Smelting Co., Ltd., 1333-2 Haraichi, Ageo, Saitama 362, Japan
T. Kuji
Affiliation:
Corporate R & D Center, Mitsui Mining & Smelting Co., Ltd., 1333-2 Haraichi, Ageo, Saitama 362, Japan
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Abstract

In the process of crystallization of amorphous melt-spun Nd15Fe77Bx (x = 6–14) alloys, it was found that the crystallization behavior strongly depended upon the boron content even in the same equilibrium three-phase coexistence range. The Nd2Fe14B phase was crystallized directly from the amorphous state in the amorphous Nd-Fe-B materials with relatively lower boron content (Nd15Fe77B6 and Nd15Fe77B8 alloys). In contrast, the metastable body-centered-cubic (bcc) α-iron phase crystallized from the amorphous state prior to the crystallization of the Nd2Fe14B phase in the amorphous Nd-Fe-B materials with relatively higher boron content (Nd15Fe77B10, Nd15Fe77B12, and Nd15Fe77B14 alloys). The existence of the metastable bcc α-iron phase in the amorphous matrix was confirmed by TEM studies, magnetic measurements, and in situ observation by x-ray diffraction. The formation of the metastable phase stabilized the amorphous state, increasing the crystallization temperature of the Nd2Fe14B phase.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 2 , February 1994 , pp. 372 - 376
Copyright
Copyright © Materials Research Society 1994

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