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Microstructure evolution of pure tungsten after low-energy and high-fluence He+ implantation assessed by synchrotron grazing incidence X-ray diffraction.

Authors :
Huang, W.J.
Sun, M.
Yang, J.F.
Wen, W.
Xie, Z.M.
Zhang, L.C.
Liu, R.
Chen, C.A.
Jiang, Y.
Wang, X.P.
Wu, X.B.
Fang, Q.F.
Source :
Journal of Nuclear Materials. Feb2021, Vol. 544, pN.PAG-N.PAG. 1p.
Publication Year :
2021

Abstract

• He+ implantation behavior of tungsten was investigated using Synchrotron XRD. • Four differently strained zones were identified in the He+ implanted tungsten. • The compressed zone is owing to the surface polishing effect and formation of He-complexes. • The expanded zone was ascribed to the helium atoms entering into the tungsten lattice. • The transition zone is a result of competition between the expanding and compressing effects A clear understanding on the H/He plasma implantation behavior in the plasma facing materials is a key issue to manage the implanted H/He in a future nuclear fusion reactor. In this work, the microstructure evolution of pure tungsten after low-energy (100 eV) and high-fluence (1023~1024 /m2) helium ion implantation was investigated by the synchrotron grazing incidence X-ray diffraction (S-GIXRD) and nanoindentation. Benefiting from the depth dependence of S-GIXRD and nanoindentation, it was found that the unimplanted W surface layer was composed of two zones: the compressed zone with a thickness of ~56 ± 2 nm under the top surface, which was introduced by the mechanical polishing, and the unaffected matrix. The helium implanted W surface layer was composed of four zones along the direction from the top surface to deep depth: the compressed zone with a thickness of ~46 ± 10 nm, transition zone with a thickness of ~146 ± 14 nm, expanded zone, and the matrix. The compressed zone becomes thinner after He implantation possibly owing to the formation of He-complexes. The expanded zone resulted from the helium atoms entering into the tungsten lattice, while the transition zone is a result of competition between the expanding and compressing effects. Image, graphical abstract [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00223115
Volume :
544
Database :
Academic Search Index
Journal :
Journal of Nuclear Materials
Publication Type :
Academic Journal
Accession number :
147887025
Full Text :
https://doi.org/10.1016/j.jnucmat.2020.152663