Niobium bulk and grain boundary diffusion in alpha-iron

被引：17

作者：

Herzig, C ^{[1
]}

Geise, J ^{[1
]}

Divinski, SV ^{[1
]}

机构：

[1] Univ Munster, Inst Materialphys, D-48149 Munster, Germany

来源：

ZEITSCHRIFT FUR METALLKUNDE | 2002年 / 93卷 / 12期

关键词：

alpha-Fe; radiotracer diffusion; bulk diffusion of Nb in alpha-Fe; grain boundary diffusion of Nb in alpha-Fe;

D O I：

10.3139/146.021180

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Bulk and gram boundary (GB) diffusion of Nb in alpha-Fe were studied in the temperature interval from about 700 to 1100 K by the radiotracer method combined with serial sectioning. A non-Arrhenius temperature dependence of Nb bulk diffusion was established below the Curie temperature T-c. This observation was discussed in relation to the wellknown magnetically-induced diffusion anomaly in alpha-Fe and to the contribution of dislocation diffusion. In contrast, a practically linear Arrhenius temperature dependence was found for Nb GB diffusion. At T-c, bulk and GB diffusion of Nb are about one order of magnitude faster than the corresponding self-diffusivities of alpha-Fe. The effect of matrix purity on Nb GB diffusion in alpha-Fe was studied.

引用

页码：1180 / 1187

页数：8

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