Migration and nucleation of helium atoms at (110) twist grain boundaries in tungsten

被引：20

作者：

Feng, Ya-Xin ^{[1
]}

Shang, Jia-Xiang ^{[1
]}

Lu, Guang-Hong ^{[2
,3
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

[2] Beihang Univ, Sch Phys & Nucl Engn, Beijing 100191, Peoples R China

[3] Beihang Univ, Beijing Key Lab Adv Nucl Mat & Phys, Beijing 100191, Peoples R China

来源：

JOURNAL OF NUCLEAR MATERIALS | 2017年 / 487卷

关键词：

Helium; Migration; Nucleation; Twist grain boundaries; Tungsten; HE INTERSTITIALS; VACANCY CLUSTERS; DIFFUSION; SIMULATIONS; RADIATION; RETENTION; DYNAMICS; DEFECTS; ENERGY;

D O I：

10.1016/j.jnucmat.2017.01.045

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The migration and nucleation of He atoms at three typical (110) twist grain boundaries (TGBs): the low-angle grain boundary (LAGB), the ordinary high-angle grain boundary (HAGB) and the Sigma 3 TGB in W are investigated using molecular dynamics simulations. The presence of TGBs can absorb He atoms from bulk and impede the growth of He bubbles. Moreover, different grain boundary (GB) structures behave differently when interacting with He atoms. The LAGB can control the He distribution on the GB plane through its screw dislocation network, suggesting a promising approach for design of radiation tolerant materials. The ordinary HAGB presents a strong trap effect due to its disordered GB structure, which may induce a large He retention at the GB and embrittlement. The Sigma 3 TGB can provide a diffusion path for He atoms, although the diffusion rate is not as fast as it in bulk. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：200 / 209

页数：10

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