Three mechanisms of hydrogen-induced dislocation pinning in tungsten

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Three mechanisms of hydrogen-induced dislocation pinning in tungsten. / Li, Y.; Morgan, T.W.; Terentyev, Dmitry; Favache, Audrey; Wirtz, Marius; Hoefnagels, J.P.M.; van Dommelen, J.A.W.; De Temmerman, Gregory; Verbeken, Kim; Geers, M.G.D.

In: Nuclear Fusion, Vol. 60, 086015, 15.07.2020, p. 1-11.

Research output: Contribution to journalArticlepeer-review

Harvard

Li, Y, Morgan, TW, Terentyev, D, Favache, A, Wirtz, M, Hoefnagels, JPM, van Dommelen, JAW, De Temmerman, G, Verbeken, K & Geers, MGD 2020, 'Three mechanisms of hydrogen-induced dislocation pinning in tungsten', Nuclear Fusion, vol. 60, 086015, pp. 1-11. https://doi.org/10.1088/1741-4326/ab98a4

APA

Li, Y., Morgan, T. W., Terentyev, D., Favache, A., Wirtz, M., Hoefnagels, J. P. M., van Dommelen, J. A. W., De Temmerman, G., Verbeken, K., & Geers, M. G. D. (2020). Three mechanisms of hydrogen-induced dislocation pinning in tungsten. Nuclear Fusion, 60, 1-11. [086015]. https://doi.org/10.1088/1741-4326/ab98a4

Vancouver

Li Y, Morgan TW, Terentyev D, Favache A, Wirtz M, Hoefnagels JPM et al. Three mechanisms of hydrogen-induced dislocation pinning in tungsten. Nuclear Fusion. 2020 Jul 15;60:1-11. 086015. https://doi.org/10.1088/1741-4326/ab98a4

Author

Li, Y. ; Morgan, T.W. ; Terentyev, Dmitry ; Favache, Audrey ; Wirtz, Marius ; Hoefnagels, J.P.M. ; van Dommelen, J.A.W. ; De Temmerman, Gregory ; Verbeken, Kim ; Geers, M.G.D. / Three mechanisms of hydrogen-induced dislocation pinning in tungsten. In: Nuclear Fusion. 2020 ; Vol. 60. pp. 1-11.

Bibtex - Download

@article{97a2aa62e967442a907a7f7c63f44020,
title = "Three mechanisms of hydrogen-induced dislocation pinning in tungsten",
abstract = "The high-flux deuterium plasma impinging a divertor degrades the long-term thermo-mechanical performance of its tungsten plasma-facing components. A prime actor in this is hydrogen embrittlement, a degradation mechanism that involves the interactions between hydrogen and dislocations, the primary carriers of plasticity. Measuring such nanoscale interactions is still very challenging, which limits our understanding. Here, we demonstrate an experimental approach that combines thermal desorption spectroscopy (TDS) and nanoindentation, allowing to investigate the effect of hydrogen on the dislocation mobility in tungsten. Dislocation mobility was found to be reduced after deuterium injection, which is manifested as a {\textquoteleft}pop-in{\textquoteright} in the indentation stress-strain curve, with an average activation stress for dislocation mobility that was more than doubled. All experimental results can be confidently explained, in conjunction with experimental and numerical literature findings, by the simultaneous activation of three mechanisms responsible for dislocation pinning:(i) hydrogen trapping at pre-existing dislocations, (ii) hydrogen-induced vacancies, and (iii) hydrogen-stabilized vacancies, contributing respectively 38%, 52%, and 34% to the extra activation stress. These mechanisms are considered to be essential for the proper understanding and modeling of hydrogen embrittlement in tungsten.",
keywords = "Hydrogen embrittlement, Dislocation mobility, Nanoindentation, Crystal defects, Thermal desorption spectroscopy, TDS",
author = "Y. Li and T.W. Morgan and Dmitry Terentyev and Audrey Favache and Marius Wirtz and J.P.M. Hoefnagels and {van Dommelen}, J.A.W. and {De Temmerman}, Gregory and Kim Verbeken and M.G.D. Geers",
note = "Score=10",
year = "2020",
month = jul,
day = "15",
doi = "10.1088/1741-4326/ab98a4",
language = "English",
volume = "60",
pages = "1--11",
journal = "Nuclear Fusion",
issn = "0029-5515",
publisher = "IOP - IOP Publishing",

}

RIS - Download

TY - JOUR

T1 - Three mechanisms of hydrogen-induced dislocation pinning in tungsten

AU - Li, Y.

AU - Morgan, T.W.

AU - Terentyev, Dmitry

AU - Favache, Audrey

AU - Wirtz, Marius

AU - Hoefnagels, J.P.M.

AU - van Dommelen, J.A.W.

AU - De Temmerman, Gregory

AU - Verbeken, Kim

AU - Geers, M.G.D.

N1 - Score=10

PY - 2020/7/15

Y1 - 2020/7/15

N2 - The high-flux deuterium plasma impinging a divertor degrades the long-term thermo-mechanical performance of its tungsten plasma-facing components. A prime actor in this is hydrogen embrittlement, a degradation mechanism that involves the interactions between hydrogen and dislocations, the primary carriers of plasticity. Measuring such nanoscale interactions is still very challenging, which limits our understanding. Here, we demonstrate an experimental approach that combines thermal desorption spectroscopy (TDS) and nanoindentation, allowing to investigate the effect of hydrogen on the dislocation mobility in tungsten. Dislocation mobility was found to be reduced after deuterium injection, which is manifested as a ‘pop-in’ in the indentation stress-strain curve, with an average activation stress for dislocation mobility that was more than doubled. All experimental results can be confidently explained, in conjunction with experimental and numerical literature findings, by the simultaneous activation of three mechanisms responsible for dislocation pinning:(i) hydrogen trapping at pre-existing dislocations, (ii) hydrogen-induced vacancies, and (iii) hydrogen-stabilized vacancies, contributing respectively 38%, 52%, and 34% to the extra activation stress. These mechanisms are considered to be essential for the proper understanding and modeling of hydrogen embrittlement in tungsten.

AB - The high-flux deuterium plasma impinging a divertor degrades the long-term thermo-mechanical performance of its tungsten plasma-facing components. A prime actor in this is hydrogen embrittlement, a degradation mechanism that involves the interactions between hydrogen and dislocations, the primary carriers of plasticity. Measuring such nanoscale interactions is still very challenging, which limits our understanding. Here, we demonstrate an experimental approach that combines thermal desorption spectroscopy (TDS) and nanoindentation, allowing to investigate the effect of hydrogen on the dislocation mobility in tungsten. Dislocation mobility was found to be reduced after deuterium injection, which is manifested as a ‘pop-in’ in the indentation stress-strain curve, with an average activation stress for dislocation mobility that was more than doubled. All experimental results can be confidently explained, in conjunction with experimental and numerical literature findings, by the simultaneous activation of three mechanisms responsible for dislocation pinning:(i) hydrogen trapping at pre-existing dislocations, (ii) hydrogen-induced vacancies, and (iii) hydrogen-stabilized vacancies, contributing respectively 38%, 52%, and 34% to the extra activation stress. These mechanisms are considered to be essential for the proper understanding and modeling of hydrogen embrittlement in tungsten.

KW - Hydrogen embrittlement

KW - Dislocation mobility

KW - Nanoindentation

KW - Crystal defects

KW - Thermal desorption spectroscopy

KW - TDS

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/41682423

U2 - 10.1088/1741-4326/ab98a4

DO - 10.1088/1741-4326/ab98a4

M3 - Article

VL - 60

SP - 1

EP - 11

JO - Nuclear Fusion

JF - Nuclear Fusion

SN - 0029-5515

M1 - 086015

ER -

ID: 6987718