Helium-implantation-induced lattice strains and defects in tungsten probed by X-ray micro-diffraction

被引：25

作者：

Das, S. ^{[1
]}

Liu, W. ^{[2
]}

Xu, R. ^{[2
]}

Hofmann, F. ^{[1
]}

机构：

[1] Univ Oxford, Dept Engn Sci, Parks Rd, Oxford OX1 3PJ, England

[2] Argonne Natl Lab, Adv Photon Source, 9700 South Cass Ave, Argonne, IL 60439 USA

来源：

MATERIALS & DESIGN | 2018年 / 160卷

基金：

英国工程与自然科学研究理事会;

关键词：

Micro-diffraction; Helium-implantation; Tungsten-rhenium; Eigenstrain; ELASTIC-CONSTANTS; DYNAMICS; TENSOR; RE; 3D;

D O I：

10.1016/j.matdes.2018.11.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tungsten is the main candidate material for plasma-facing armour components in future fusion reactors. Bombardment with energetic fusion neutrons causes collision cascade damage and defect formation. Interaction of defectswith helium, produced by transmutation and injected from the plasma, modifies defect retention and behaviour. Hereweinvestigate the residual lattice strains caused by different doses of helium-ion-implantation into tungsten and tungsten-rheniumalloys. Energy and depth-resolved synchrotron X-raymicro-diffraction uniquely permits the measurement of lattice strainwith sub-micron 3D spatial resolution and similar to 10(-4) strain sensitivity. Increase of helium dose from 300 appm to 3000 appm increases volumetric strain by only similar to 2.4 times, indicating that defect retention per injected helium is similar to 3 times higher at low helium doses. This suggests defect retention is not a simple function of implanted helium dose, but strongly depends on material composition and presence of impurities. Conversely, analysis of W-1 wt% Re alloy samples and of different crystal orientations shows that both the presence of rhenium, and crystal orientation, have a comparatively small effect on defect retention. These insights are key for the design of armour components in future reactors where it will be essential to account for irradiation-induced dimensional change when predicting component lifetime and performance. (c) 2018 Elsevier Ltd. All rights reserved.

引用

页码：1226 / 1237

页数：12

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