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Characterization of the disproportionated NdFeCoZrB alloy by means of electron microscopy

Published online by Cambridge University Press:  31 January 2011

Jian-rong Gao ,
Xiao-ping Song  and
Xiao-tian Wang
Jian-rong Gao
Affiliation:
School of Materials, Xi'an Jiaotong University, Xi'an 710049, China
Xiao-ping Song
Affiliation:
School of Materials, Xi'an Jiaotong University, Xi'an 710049, China
Xiao-tian Wang
Affiliation:
School of Materials, Xi'an Jiaotong University, Xi'an 710049, China
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Abstract

The microstructure of the disproportionated NdFeCoZrB alloy during the solid-HDDR (hydrogenation-disproportionation-desorption-recombination) process was investigated by means of scanning electron microscope (SEM) and transmission electron microscope (TEM). Except for a similar colony-type structure to ternary alloy, fine particles including spherical (Fe, Co)2B phase and undecomposed rim-like Nd2(Fe, Co)14B compound were found dispersed within the α–(Fe, Co) matrix of the microstructure of the disproportionated NdFeCoZrB alloy. An unknown Fe-rich phase with a comparable size to that of the matrix grain was also detected by electron diffraction. These results strongly suggest that the undecomposed rim-like Nd2(Fe, Co)14B particles are probably the memory sites for the origin of anisotropy of the received NdFeCoZrB materials.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 3 , March 1997 , pp. 581 - 584
Copyright
Copyright © Materials Research Society 1997

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