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

Abstract

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 defects with helium, produced by transmutation and injected from the plasma, modifies defect retention and behaviour. Here we investigate the residual lattice strains caused by different doses of helium-ion-implantation into tungsten and tungsten-rhenium alloys. Energy and depth-resolved synchrotron X-ray micro-diffraction uniquely permits the measurement of lattice strain with sub-micron 3D spatial resolution and ~10-4 strain sensitivity. Increase of helium dose from 300 appm to 3000 appm increases volumetric strain by only ~2.4 times, indicating that defect retention per injected helium is ~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.

Authors:
 [1];  [2];  [2]; ORCiD logo [1]
  1. Univ. of Oxford (United Kingdom). Dept. of Engineering Science
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Org.:
Leverhulme Trust; USDOE Office of Science (SC); Engineering and Physical Sciences Research Council (EPSRC)
OSTI Identifier:
1507089
Grant/Contract Number:  
AC02-06CH11357; EP/H018921/1
Resource Type:
Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 160; Journal Issue: C; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; eigenstrain; helium-implantation; micro-diffraction; tungsten-rhenium

Citation Formats

Das, S., Liu, W., Xu, R., and Hofmann, F. Helium-implantation-induced lattice strains and defects in tungsten probed by X-ray micro-diffraction. United States: N. p., 2018. Web. doi:10.1016/j.matdes.2018.11.001.
Das, S., Liu, W., Xu, R., & Hofmann, F. Helium-implantation-induced lattice strains and defects in tungsten probed by X-ray micro-diffraction. United States. https://doi.org/10.1016/j.matdes.2018.11.001
Das, S., Liu, W., Xu, R., and Hofmann, F. Mon . "Helium-implantation-induced lattice strains and defects in tungsten probed by X-ray micro-diffraction". United States. https://doi.org/10.1016/j.matdes.2018.11.001. https://www.osti.gov/servlets/purl/1507089.
@article{osti_1507089,
title = {Helium-implantation-induced lattice strains and defects in tungsten probed by X-ray micro-diffraction},
author = {Das, S. and Liu, W. and Xu, R. and Hofmann, F.},
abstractNote = {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 defects with helium, produced by transmutation and injected from the plasma, modifies defect retention and behaviour. Here we investigate the residual lattice strains caused by different doses of helium-ion-implantation into tungsten and tungsten-rhenium alloys. Energy and depth-resolved synchrotron X-ray micro-diffraction uniquely permits the measurement of lattice strain with sub-micron 3D spatial resolution and ~10-4 strain sensitivity. Increase of helium dose from 300 appm to 3000 appm increases volumetric strain by only ~2.4 times, indicating that defect retention per injected helium is ~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.},
doi = {10.1016/j.matdes.2018.11.001},
journal = {Materials & Design},
number = C,
volume = 160,
place = {United States},
year = {Mon Nov 05 00:00:00 EST 2018},
month = {Mon Nov 05 00:00:00 EST 2018}
}

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Works referencing / citing this record:

Recent advances in characterising irradiation damage in tungsten for fusion power
journal, November 2019


Hardening and Strain Localisation in Helium-Ion-Implanted Tungsten
journal, December 2019


Orientation-dependent indentation response of helium-implanted tungsten
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Hardening and Strain Localisation in Helium-Ion-Implanted Tungsten
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