The effect of helium implantation on the deformation behaviour of tungsten: X-ray micro-diffraction and nanoindentation. (15th March 2018)

• Record Type: Journal Article
• Authors: Das, S.; Armstrong, D.E.J.; Zayachuk, Y.; Liu, W.; Xu, R.; Hofmann, F.
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 335
• Page End: 339
• Publication Date: 2018-03-15
• Subjects: Nanoindentation -- Laue micro-diffraction -- Ion implantation damage -- Fusion armour materials; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.12.014
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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. Graphical abstract: Image 2