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Effects of quench rate on the microstructure in melt-spun Nd–Fe–B alloys

Published online by Cambridge University Press:  31 January 2011

A. Zaluska ,
Yan Xu ,
Z. Altounian ,
J.O. Ström-Olsen ,
R. Allem  and
G. L'Espérance
A. Zaluska
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, Canada, H3A 2T8
Yan Xu
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, Canada, H3A 2T8
Z. Altounian
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, Canada, H3A 2T8
J.O. Ström-Olsen
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, Canada, H3A 2T8
R. Allem
Affiliation:
Centre for the Physics of Materials and Department of Physics, McGill University, 3600 University Street, Montreal, Quebec, Canada, H3A 2T8
G. L'Espérance
Affiliation:
Ecole Polytechnique, Departement de Genie Physique, P.O. Box 6079, Montreal, Quebec, Canada, H3C 3A7
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Abstract

Electron microscope studies have shown significant changes in the microstructure of the Nd14Fe80B6 melt-spun ribbons, depending on the quenching conditions. The average grain size of about 20 nm near the wheel side, increasing to 500–700 nm near the free side, can be observed for ribbons of the thickness of about 25–30 μm, indicating strong internal variations in quench rate across the ribbon thickness. For low quenching rates different morphologies of the crystalline phase Nd2Fe14B are observed. Equiaxed grains near the wheel side of the ribbon become columnar grains or even dendritic grains near the free side. Texturing effects in the equiaxed grains are observed only for grains larger than 30 nm and disappear for very large equiaxed grains (about 500 nm), as well as for dendritic structures. Most evident texture is observed in columnar grains, which crystallized with the c-axis perpendicular to the ribbon plane.

Type
Articles
Information
Journal of Materials Research , Volume 6 , Issue 4 , April 1991 , pp. 724 - 730
Copyright
Copyright © Materials Research Society 1991

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