Issue 41, 2017

First-principles investigation of the orientation influenced He dissolution and diffusion behaviors on W surfaces

Abstract

The dissolution and diffusion behaviors of helium (He) for four low-Miller-index tungsten (W) surfaces [(110), (100), (112), and (111)] are systematically studied using the density functional theory to understand the surface-orientation-dependent He bubble formation. The results show that He accumulation on the surfaces is mainly affected by self-trapping and the formation of He-induced vacancies. He-induced vacancies tend to form on the surfaces of W(111), W(100), and W(112) than in the bulk. Specifically, for the W(111) surface, He accumulation is facilitated by the high activation barrier arising from He-induced vacancy trapping, whereas the W(110) surface is resistant to the formation of He bubbles because of the higher vacancy and He formation energies. Our results are helpful for understanding the orientation dependence of surface damage on the W surface under low-energy high flux He ion irradiation and designing irradiation-resistant plasma-facing materials.

Graphical abstract: First-principles investigation of the orientation influenced He dissolution and diffusion behaviors on W surfaces

Supplementary files

Article information

Article type
Paper
Submitted
21 Mar 2017
Accepted
27 Apr 2017
First published
15 May 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 25789-25795

First-principles investigation of the orientation influenced He dissolution and diffusion behaviors on W surfaces

G. Y. Pan, Y. G. Li, Y. S. Zhang, C. G. Zhang, Z. Zhao and Z. Zeng, RSC Adv., 2017, 7, 25789 DOI: 10.1039/C7RA03281A

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements