Key mechanistic features of swelling and blistering of helium-ion-irradiated tungsten

被引：67

作者：

Allen, Frances I. ^{[1
,2
]}

Hosemann, Peter ^{[3
,4
]}

Balooch, Mehdi ^{[3
]}

机构：

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] LBNL, Mol Foundry, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Dept Nucl Engn, Berkeley, CA 94720 USA

[4] LBNL, Mat Sci Div, Berkeley, CA 94720 USA

来源：

SCRIPTA MATERIALIA | 2020年 / 178卷

基金：

美国国家科学基金会;

关键词：

Tungsten; Helium ion irradiation; Surface blistering; Inert gas nanobubbles; Helium ion microscopy; LATERAL STRESS; GAS; TEM; BEHAVIOR; COPPER; NIOBIUM; SILICON;

D O I：

10.1016/j.scriptamat.2019.11.039

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Helium-ion-induced swelling and blistering of single-crystal tungsten is investigated using a Helium Ion Microscope for site-specific dose-controlled irradiation (at 25 keV) with analysis by Helium Ion Microscopy, Atomic Force Microscopy and Transmission Electron Microscopy (cross-sectioning by Focused Ion Beam milling). We show that the blister cavity forms at a depth close to the simulated helium peak and that nanobubbles coalesce to form nanocracks within the envelope of the ion stopping range, swelling the blister shell. These results provide the first direct experimental evidence for the interbubble fracture mechanism proposed in the framework of the gas pressure model for blister formation. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：256 / 260

页数：5

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