Stress-induced hydrogen self-trapping in tungsten

Smirnov, R. D.; Krasheninnikov, S. I.

doi:10.1088/1741-4326/aae2c7

Title: Stress-induced hydrogen self-trapping in tungsten

Journal Article · 04 October 2018 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/aae2c7 · OSTI ID:1476358

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Univ. of California, San Diego, CA (United States). Dept. of Mechanical and Aerospace Engineering; University of California San Diego
Univ. of California, San Diego, CA (United States). Dept. of Mechanical and Aerospace Engineering

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 ~0.3-1 at.%. The spontaneous hydrogen platelet formation in absence of dislocations and external stresses has been also observed at the higher hydrogen concentrations ~10 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 latelets 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.

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Grant/Contract Number:: SC0018302

OSTI ID:: 1476358

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 58; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Stress-induced hydrogen self-trapping in tungsten

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