THE EFFECT OF HYDROGEN PRESSURE ON THE KINETICS OF THE HDDR-PROCESS OF BULK ND-FE-B-TYPE ALLOYS

被引：5

作者：

GUTFLEISCH, O

SHORT, C

VERDIER, M

HARRIS, IR

机构：

[1] School of Metallurgy and Materials Science, University of Birmingham, Birmingham

来源：

IEEE TRANSACTIONS ON MAGNETICS | 1994年 / 30卷 / 02期

关键词：

D O I：

10.1109/20.312362

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The HDDR (hydrogenation, disproportionation, desorption, recombination)-process of bulk Nd-Fe-B-type alloys has been investigated by in-situ electrical resistivity measurements. The effect of hydrogen pressure on the rate of the disproportionation reaction, in which the Nd2Fe14B phase forms Fe, Nd-hydride and Fe2B, was studied in detail on a Nd14.68Dy0.94Al0.62Fe76.47Nb0.5B6.79 alloy, which is used for the production of commercial permanent magnets. Experimental data reveal a strong dependence of the HDDR-kinetics on the hydrogen pressure which was varied between p(H-2)=0.1-1.0 bar at T=750-degrees-C. Optical micrographs suggest that the Nd-rich grain boundary phase acts as a diffusion path for the hydrogen in the HDDR-process. The 2-14-1 matrix phase subsequently disproportionates from the grain boundary phase inwards.

引用

页码：642 / 644

页数：3

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