Grazing-incidence electron microscopy of surface blisters in single- and polycrystalline tungsten formed by H+, D+ and He+ irradiation

Enomoto, Naruaki; Muto, Shunsuke; Tanabe, T.; Davis, J.W.; Haasz, A.A.

doi:10.1016/j.jnucmat.2009.01.298

Cited by 60 publications

(31 citation statements)

References 42 publications

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“…The bright lines located at the rim of the blisters are caused by an increased emission of secondary electrons and indicate the rupture of the blisters at this positions. This observation agrees well with the FEM simulations by Enomoto et al [7], which show that the largest stress occurs at the edge of the blisters. In grain A to D the portion of open blisters is 67, 57, 64 and 87 %, respectively.…”

Section: A2 Blister Characterizationsupporting

confidence: 93%

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Influence of near-surface blisters on deuterium transport in tungsten

et al. 2017

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The effect of near-surface blisters on deuterium transport in tungsten is studied by means of nuclear reaction analysis (NRA) and scanning electron microscopy (SEM). Gentle deuterium plasma loading of different durations and subsequent NRA depth profiling is performed in heavily pre-blistered and unblistered areas on self-damaged tungsten samples.Comparison of the deuterium depth profiles reveals a considerable reduction of the deuterium transport into the bulk due to the presence of near-surface blisters. SEM and NRA results identify the enhanced re-emission of deuterium from the sample due to open blisters as the underlying mechanism which reduces the deuterium flux into the bulk. Based on a simple analytical hydrogen retention model, the re-emitted deuterium flux by open blisters in the here conducted experiment, is determined to be 80 % of the implanted deuterium flux. In addition, the deuterium flux into the bulk is reduced by 60 % compared to the unblistered case. As a consequence, deuterium retention studies carried out under blister-facilitating conditions should account for surface morphology which reduce the deuterium uptake.

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Section: A2 Blister Characterizationsupporting

confidence: 93%

“…The appearance of blisters is influenced by many different parameters, e.g. sample temperature [6,7], ion energy [8], ion flux [9,10], ion fluence [8], grain orientation [11], material grade [12] and surface finish [13]. As large as the parameter space which determines blistering, as large is the variety of shapes in which blisters occur.…”

Section: Introductionmentioning

confidence: 99%

Influence of near-surface blisters on deuterium transport in tungsten

et al. 2017

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“…In Ref. [20] it was considered that the thermalized implanted atoms diffuse a considerable distance beyond the ion range and accumulate at much greater depths. It was proposed that hydrogen trapping first occurs predominantly within the implantation zone at impurities, dislocations, vacancies, grain boundaries and other crystal defects.…”

Section: Discussion On Mechanisms Of Blister Formationmentioning

confidence: 99%

Blister formation on 13Cr2MoNbVB ferritic-martensitic steel exposed to hydrogen plasma

Nikitin

Tolstolutskaya

Ruzhytskyi

et al. 2016

Journal of Nuclear Materials

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“…These works can be categorized into analytical [6e8] and numerical [9,10] studies. The analytical studies were mostly focused on adapting the closed elastic stress solutions of a pressurized thin plate to a blister cap on the basis of plate theories and studying blister growth which was modeled as a crack extension event in the framework of linear elastic fracture mechanics.…”

Section: Introductionsmentioning

confidence: 99%

Mechanics of tungsten blistering II: Analytical treatment and fracture mechanical assessment

You

2015

Journal of Nuclear Materials

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Plasma-facing armor Blister Crack J-integral Strain energy release rate a b s t r a c t Since a decade the blistering of pure tungsten under hydrogen implantation has been one of the major research topics in relation to the plasmaewall interaction of tungsten-armored first wall. Overall blistering may reduce the erosion lifetime of the wall. Mature blisters grown by high internal pressure are likely to burst leading to exfoliation of the surface. Therefore, the control and suppression of blistering is an important concern for sustainable operation of the tungsten-armored plasma-facing components. In this context, a quantitative assessment of the mechanical conditions for blister bulging and growth is an important concern.In this article a theoretical framework is presented to describe the bulging deformation of tungsten blisters and to estimate the mechanical driving force of blister growth. The validity of the analytical formulations based on the theory of elastic plates is evaluated with the help of finite element analysis. Plastic strains and J-integral values at the blister boundary edge are assessed by means of numerical simulation. Extensive parametric studies were performed for a range of blister geometry (cap aspect ratio), gas pressure, yield stress and hardening rate. The characteristic features of the blistering mechanics are discussed and the cracking energy is quantitatively estimated for the various combinations of parameters.

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Grazing-incidence electron microscopy of surface blisters in single- and polycrystalline tungsten formed by H+, D+ and He+ irradiation

Cited by 60 publications

References 42 publications

Influence of near-surface blisters on deuterium transport in tungsten

Influence of near-surface blisters on deuterium transport in tungsten

Blister formation on 13Cr2MoNbVB ferritic-martensitic steel exposed to hydrogen plasma

Mechanics of tungsten blistering II: Analytical treatment and fracture mechanical assessment

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