Evolution of plastic deformation in heavily deformed and recrystallized tungsten of ITER specification studied by TEM

Microstructure induced by plastic deformation at 600 °C in as-fabricated and recrystallized tungsten grades of ITER specification is studied by means of transmission electron microscopy (TEM). Both grades are produced by AG Plansee and being used by fusion community as research material for plasma f...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2017-08, Vol.66, p.105-115
Main Authors: Dubinko, A., Terentyev, D., Bakaeva, A., Verbeken, K., Wirtz, M., Hernández-Mayoral, M.
Format: Article
Language:English
Subjects:
Dislocation density
Evolution
Grain boundaries
Heat flux
Indentation
Microstructure
Necking
Parameter modification
Plastic deformation
Recrystallization
Scanning electron microscopy
Specifications
Transmission electron microscopy
Tungsten
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Summary:Microstructure induced by plastic deformation at 600 °C in as-fabricated and recrystallized tungsten grades of ITER specification is studied by means of transmission electron microscopy (TEM). Both grades are produced by AG Plansee and being used by fusion community as research material for plasma facing and high heat flux components. Reference microstructure was investigated by a combination of TEM, scanning electron microscopy and nano-indentation techniques. TEM was applied to investigate the necking region in the tensile samples deformed up to ~ 30% of stain. The deformation-induced microstructure was characterized and compared for the two grades in terms of the dislocation density, heterogeneity, observation of pile-ups and tangles specifically near high angle grain boundaries. The obtained evolution of the dislocation density was compared with the prediction of the previously developed thermo-mechanical model for the plastic deformation of polycrystalline tungsten and a good agreement was found without modification of the original parameter set.
ISSN:0263-4368
DOI:10.1016/j.ijrmhm.2017.03.004