EXPERIMENTAL STUDIES OF GRAIN-BOUNDARY DIFFUSION OF HYDROGEN IN METALS

被引：81
|
作者：
YAO, J [1 ]
CAHOON, JR [1 ]
机构：
[1] UNIV MANITOBA, DEPT MECH ENGN, MET SCI LAB, WINNIPEG R3T 2N2, MANITOBA, CANADA
来源：
ACTA METALLURGICA ET MATERIALIA | 1991年 / 39卷 / 01期
关键词：
D O I：
10.1016/0956-7151(91)90333-V
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electrochemical permeation tests and silver decoration tests were performed in polycrystalline nickle with different grain sizes. Comparison of experimental results with theoretical predictions of a newly proposed grain boundary diffusion model indicates that grain boundaries are not high diffusivity paths for hydrogen. The sominant role played by grain boundaries during mass transport of hydrogen is retardation due to the trapping effect. The grain boundary diffusivity of hydrogen is concentration dependent. When the hydrogen concentration is extremely low, the grain boundary diffusion of hydrogen is virtually stopped. It is postulated that the low energy sites within grain boundaries are responsible for such retardation. © 1991.
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页码：119 / 126
页数：8
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