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Title: The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation

Abstract

Here, the effect of helium-implantation-induced defects on deformation behaviour is examined by comparing spherical nano-indents in unimplanted and helium-implanted regions of a tungsten single crystal. Helium-implantation increases hardness and causes large pileups. 3D-resolved X-ray micro-diffraction uniquely allows examination of the complex lattice distortions beneath specific indents. In the ion-implanted material we find reduced lattice rotations and residual strains due to indentation, indicating a more confined plastic zone. Together, our observations suggest that helium-induced defects initially act as efficient obstacles to dislocation motion, but are weakened by the subsequent passage of dislocations, causing a reduction in work hardening capacity.

Authors:
 [1];  [1];  [1];  [2];  [2];  [1]
  1. Univ. of Oxford, Oxford (United Kingdom)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Engineering and Physical Sciences Research Council (EPSRC); USDOE
OSTI Identifier:
1466395
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 146; Journal Issue: C; Journal ID: ISSN 1359-6462
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Nanoindentation; Laue micro-diffraction; Ion implantation damage; Fusion armour materials

Citation Formats

Das, S., Armstrong, D. E. J., Zayachuk, Y., Liu, W., Xu, R., and Hofmann, Felix. The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation. United States: N. p., 2018. Web. doi:10.1016/j.scriptamat.2017.12.014.
Das, S., Armstrong, D. E. J., Zayachuk, Y., Liu, W., Xu, R., & Hofmann, Felix. The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation. United States. doi:10.1016/j.scriptamat.2017.12.014.
Das, S., Armstrong, D. E. J., Zayachuk, Y., Liu, W., Xu, R., and Hofmann, Felix. Thu . "The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation". United States. doi:10.1016/j.scriptamat.2017.12.014. https://www.osti.gov/servlets/purl/1466395.
@article{osti_1466395,
title = {The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation},
author = {Das, S. and Armstrong, D. E. J. and Zayachuk, Y. and Liu, W. and Xu, R. and Hofmann, Felix},
abstractNote = {Here, the effect of helium-implantation-induced defects on deformation behaviour is examined by comparing spherical nano-indents in unimplanted and helium-implanted regions of a tungsten single crystal. Helium-implantation increases hardness and causes large pileups. 3D-resolved X-ray micro-diffraction uniquely allows examination of the complex lattice distortions beneath specific indents. In the ion-implanted material we find reduced lattice rotations and residual strains due to indentation, indicating a more confined plastic zone. Together, our observations suggest that helium-induced defects initially act as efficient obstacles to dislocation motion, but are weakened by the subsequent passage of dislocations, causing a reduction in work hardening capacity.},
doi = {10.1016/j.scriptamat.2017.12.014},
journal = {Scripta Materialia},
issn = {1359-6462},
number = C,
volume = 146,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: (a) Profile of injected helium ion concentration calculated by SRIM (solid line) and the anticipated displacement damage (dashed line) plotted as a function of depth in the sample. (b) Load versus displacement curves for spherical indentation of the unimplanted and helium-implanted sample (faint lines = mean +- onemore » standard deviation computed over 16 indents).« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.