Tungsten bending under hydrogen irradiation

Bending of a thin tungsten strip, fixed at one of the ends, under hydrogen plasma exposure was studied by the laser deflection technique. Two stages of the bending were observed: a rapid bending of the stripe outwards the plasma and then a slow bending in the opposite direction that is towards the p...

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Bibliographic Details
Published inJournal of nuclear materials Vol. 424; no. 1-3; pp. 89 - 93
Main Authors Moshkunov, K.A., Schmid, K.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2012
Subjects
Bending
Blisters
Curvature
Deflection
Hydrogen plasma
Lasers
Mathematical analysis
Stresses
Tungsten
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Summary:Bending of a thin tungsten strip, fixed at one of the ends, under hydrogen plasma exposure was studied by the laser deflection technique. Two stages of the bending were observed: a rapid bending of the stripe outwards the plasma and then a slow bending in the opposite direction that is towards the plasma. The first stage has been concluded to be due to creation of stresses in the near-surface layer, and the second one – due to stresses of the opposite sign, possibly provoked/accompanied by generation of blisters on the plasma exposed surface. Calculations of the fluence dependence of the bending curvature based on the models of hydrogen supersaturation in the near-surface layer and contraction of the surface due to blister formation agree with the experimental data.
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2012.02.017