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

Das, S.; Armstrong, D. E. J.; Zayachuk, Y.; Liu, W.; Xu, R.; Hofmann, Felix

doi:10.1016/j.scriptamat.2017.12.014

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

Journal Article · 04 January 2018 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2017.12.014 · OSTI ID:1466395

Das, S. ^[1]; Armstrong, D. E. J. ^[1]; Zayachuk, Y. ^[1]; Liu, W. ^[2]; Xu, R. ^[2]; Hofmann, Felix ^[1]

Univ. of Oxford, Oxford (United Kingdom)
Argonne National Lab. (ANL), Argonne, IL (United States)

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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Engineering and Physical Sciences Research Council (EPSRC); USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1466395

Journal Information:: Scripta Materialia, Vol. 146, Issue C; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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