Impact of helium irradiation on the crystallographic orientation change in single-crystalline tungsten

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Article number076011
Journal / PublicationNuclear Fusion
Issue number7
Online published9 Jun 2021
Publication statusPublished - Jul 2021
Externally publishedYes


Understanding the helium effects on the surface modifications of tungsten is of great interest and significance for developing plasma-facing materials. Our recent studies revealed that the ion irradiation of helium at room temperature produces ⟨111⟩-oriented surface grains in single-crystalline tungsten {100} and {110}, which may play an important role in the surface and subsurface evolutions of tungsten subjected to fusion-relevant service environments. Although the driving force for the formation of surface grains is well explained by ion channeling effect, the underlying formation mechanism remains unclear. In this work, we investigated the orientation relationship between irradiation-induced new surface grains and single-crystalline tungsten matrix. The experimental results of electron backscatter diffraction demonstrated that the formation of most ⟨111⟩-oriented surface grains in both helium-irradiated tungsten {100} or {110} can be regarded as the grain rotation of matrix around its in-plane ⟨110⟩ axis.

Research Area(s)

  • helium effects, surface modification, tungsten