On the shear strength of tungsten nano-structures with embedded helium

Modification of plastic properties of tungsten nano-structures under shear stress load due to embedded helium atoms is studied using molecular dynamics modelling. The modelling demonstrates that the yield strength of tungsten nano-structures reduces significantly with increasing embedded helium conc...

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Published in:Nuclear fusion 2013-08, Vol.53 (8), p.82002-4
Main Authors: Smirnov, R.D., Krasheninnikov, S.I.
Format: Article
Language:English
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Helium
Modelling
Molecular dynamics
Nanostructure
Stress concentration
Tungsten
Yield strength
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description Modification of plastic properties of tungsten nano-structures under shear stress load due to embedded helium atoms is studied using molecular dynamics modelling. The modelling demonstrates that the yield strength of tungsten nano-structures reduces significantly with increasing embedded helium concentration. At high helium concentrations (>10 at%), the yield strength decreases to values characteristic to the pressure in helium nano-bubbles, which are formed in tungsten under such conditions and thought to be responsible for the formation of nano-fuzz on tungsten surfaces irradiated with helium plasma. It is also shown that tungsten plastic flow strongly facilitates coagulation of helium clusters to larger bubbles. The temperature dependencies of the yield strength are obtained.
doi_str_mv 10.1088/0029-5515/53/8/082002
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subjects Helium
Modelling
Molecular dynamics
Nanostructure
Stress concentration
Tungsten
Yield strength
title On the shear strength of tungsten nano-structures with embedded helium
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