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

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

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., 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. 2018. "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},
number = C,
volume = 146,
place = {United States},
year = {2018},
month = {1}
}