Diffusion of He interstitial and di-He cluster at grain boundaries in α-Fe

被引：36

作者：

Gao, F. ^{[1
]}

Heinisch, H. L. ^{[1
]}

Kurtz, R. J. ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2007年 / 367卷 / 446-450期

关键词：

D O I：

10.1016/j.jnucmat.2007.03.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A systematic molecular dynamics study of the diffusion mechanisms of He interstitial and di-He cluster at two representative interfaces has been carried out in alpha-Fe. The diffusion coefficient of a He interstitial and the effective migration energies were determined. The He atom diffuses along the Sigma 11 grain boundary one-dimensionally along specific directions, while it migrates two-dimensionally at low temperatures, and three-dimensionally at higher temperatures, in the Sigma 3 grain boundary. The di-He interstitial cluster can migrate rapidly along the 13 interface at low temperatures, but not at the Sigma 11 interface. It has been observed that a di-He interstitial cluster can kick out a self interstitial atom (SIA) at high temperatures, forming a He2V complex. The SIA migrates rapidly near interfaces, whereas the He2V complex is immobile at the temperatures considered. This small cluster may serve as the smallest nucleation for the formation of helium bubbles at interfaces. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：446 / 450

页数：5

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