Hydrogen diffusion in ultrafine-grained iron with the body-centered cubic crystal structure
Hydrogen diffusion in ultrafine-grained iron with the body-centered cubic crystal structure
复制标题
体心立方晶体结构超细晶铁中的氢扩散
DOI：
10.1080/09500839.2017.1300702
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发表时间：
2017
影响因子：
1.2
通讯作者：
Zenji Horita
中科院分区：
文献类型：
--
作者：
Hideaki Iwaoka;Makoto Arita;Zenji Horita
采用高压扭转（HPT）工艺制备超细晶Fe，通过电化学渗透试验研究了Fe中晶界对氢扩散的作用。渗透试验也进行了冷轧和水淬铁，了解位错和空位的捕获效果。氢扩散在所有这些光盘延迟。然而，在HPT处理的光盘的延迟机制是不同的，在轧制和水淬铁。晶界不作为捕获网站，但减缓扩散。由于氢在晶界扩散的激活能较高，HPT处理显著降低了氢的扩散系数。
The role of grain boundaries in Fe on hydrogen diffusion has been investigated by electrochemical permeation tests using ultrafine-grained Fe produced by high-pressure torsion (HPT) processing. Permeation tests were also conducted on cold-rolled and water-quenched Fe to understand the trapping effect of dislocations and vacancies. Hydrogen diffusion was delayed in all these discs. However, the delay mechanism in the HPT-processed disc was different from that in rolled and water-quenched Fe. Grain boundaries do not act as trapping sites but slow the diffusion. The diffusion coefficients of hydrogen were significantly decreased by HPT processing on account of the high activation energy for hydrogen diffusion in grain boundaries.