Stress-induced hydrogen self-trapping in tungsten

The molecular dynamics simulations of trapping of hydrogen atoms in tungsten are presented. The simulations reveal formation of platelet-like structures of self-trapped hydrogen induced by stresses in tungsten, in particular, those produced by dislocations, at the interstitial hydrogen concentration...

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Bibliographic Details
Published in:Nuclear fusion 2018-10, Vol.58 (12), p.126016
Main Authors: Smirnov, R.D., Krasheninnikov, S.I.
Format: Article
Language:English
Subjects:
08 HYDROGEN
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATOMIC AND MOLECULAR PHYSICS
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
fusion devices
hydrogen
MATERIALS SCIENCE
molecular dynamics
retention
tungsten
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Summary:The molecular dynamics simulations of trapping of hydrogen atoms in tungsten are presented. The simulations reveal formation of platelet-like structures of self-trapped hydrogen induced by stresses in tungsten, in particular, those produced by dislocations, at the interstitial hydrogen concentrations at.%. The spontaneous hydrogen platelet formation in absence of dislocations and external stresses has been also observed at the higher hydrogen concentrations at.%. It is shown that the platelets can retain substantial quantities of hydrogen, exceeding trapping capacity of other non-cavity defects in tungsten. The properties of the hydrogen platelets formed in tungsten under various conditions are assessed and a formation mechanism is proposed. A model of hydrogen retention by the dislocation-induced structures is also presented, which describes retained quantities and outgassing dynamics of hydrogen in plasma exposed tungsten samples.
ISSN:0029-5515
1741-4326
DOI:10.1088/1741-4326/aae2c7