Hardening and Strain Localisation in Helium-Ion-Implanted Tungsten

Das, Suchandrima; Yu, Hongbing; Tarleton, Edmund; Hofmann, Felix

doi:10.1038/s41598-019-54753-3

Hardening and Strain Localisation in Helium-Ion-Implanted Tungsten

Journal Article · Wed Dec 04 04:00:00 EST 2019 · Scientific Reports

DOI:https://doi.org/10.1038/s41598-019-54753-3· OSTI ID:1624512

^[1]; Yu, Hongbing ^[2]; ^[3]; ^[2]

Univ. of Oxford (United Kingdom). Dept. of Engineering Science; DOE/OSTI
Univ. of Oxford (United Kingdom). Dept. of Engineering Science
Univ. of Oxford (United Kingdom). Dept. of Engineering Science; Univ. of Oxford (United Kingdom). Dept. of Materials

Tungsten is the main candidate material for plasma-facing armour components in future fusion reactors. In-service, fusion neutron irradiation creates lattice defects through collision cascades. Helium, injected from plasma, aggravates damage by increasing defect retention. Both can be mimicked using helium-ion-implantation. In a recent study on 3000 appm helium-implanted tungsten (W-3000He), we hypothesized helium-induced irradiation hardening, followed by softening during deformation. The hypothesis was founded on observations of large increase in hardness, substantial pile-up and slip-step formation around nano-indents and Laue diffraction measurements of localised deformation underlying indents. Here we test this hypothesis by implementing it in a crystal plasticity finite element (CPFE) formulation, simulating nano-indentation in W-3000He at 300 K. The model considers thermally-activated dislocation glide through helium-defect obstacles, whose barrier strength is derived as a function of defect concentration and morphology. Only one fitting parameter is used for the simulated helium-implanted tungsten; defect removal rate. The simulation captures the localised large pile-up remarkably well and predicts confined fields of lattice distortions and geometrically necessary dislocation underlying indents which agree quantitatively with previous Laue measurements. Strain localisation is further confirmed through high resolution electron backscatter diffraction and transmission electron microscopy measurements on cross-section lift-outs from centre of nano-indents in W-3000He.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1624512

Journal Information:: Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 9; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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