Surface hardening induced by high flux plasma in tungsten revealed by nano-indentation

Dmitry Terentyev; Anastasiia Bakaeva; Thomas Pardoen; Audrey Favache; Evgeni E. Zhurkin

doi:10.1016/j.jnucmat.2016.04.007

Surface hardening induced by high flux plasma in tungsten revealed by nano-indentation

Dmitry Terentyev, Anastasiia Bakaeva, Thomas Pardoen, Audrey Favache, Evgeni E. Zhurkin

Research output › peer-review

Abstract

Surface hardness of tungsten after high flux deuterium plasma exposure has been characterized by nanoindentation. The effect of plasma exposure was rationalized on the basis of available theoretical models. Resistance to plastic penetration is enhanced within the 100 nm sub-surface region, attributed to the pinning of geometrically necessary dislocations on nanometric deuterium cavities e signature of plasma-induced defects and deuterium retention. Sub-surface extension of thereby registered plasmainduced damage is in excellent agreement with the results of alternative measurements. The study demonstrates suitability of nano-indentation to probe the impact of deposition of plasma-induced defects in tungsten on near surface plasticity under ITER-relevant plasma exposure conditions.

Original language	English
Pages (from-to)	1-4
Journal	Journal of Nuclear Materials
Volume	476
DOIs	https://doi.org/10.1016/j.jnucmat.2016.04.007
State	Published - 1 Aug 2016

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Cite this

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title = "Surface hardening induced by high flux plasma in tungsten revealed by nano-indentation",

abstract = "Surface hardness of tungsten after high flux deuterium plasma exposure has been characterized by nanoindentation. The effect of plasma exposure was rationalized on the basis of available theoretical models. Resistance to plastic penetration is enhanced within the 100 nm sub-surface region, attributed to the pinning of geometrically necessary dislocations on nanometric deuterium cavities e signature of plasma-induced defects and deuterium retention. Sub-surface extension of thereby registered plasmainduced damage is in excellent agreement with the results of alternative measurements. The study demonstrates suitability of nano-indentation to probe the impact of deposition of plasma-induced defects in tungsten on near surface plasticity under ITER-relevant plasma exposure conditions.",

keywords = "Dislocations, Tungsten, Hydroge, Embrittlement",

author = "Dmitry Terentyev and Anastasiia Bakaeva and Thomas Pardoen and Audrey Favache and Zhurkin, {Evgeni E.}",

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AU - Terentyev, Dmitry

AU - Bakaeva, Anastasiia

AU - Pardoen, Thomas

AU - Favache, Audrey

AU - Zhurkin, Evgeni E.

N1 - Score=10

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N2 - Surface hardness of tungsten after high flux deuterium plasma exposure has been characterized by nanoindentation. The effect of plasma exposure was rationalized on the basis of available theoretical models. Resistance to plastic penetration is enhanced within the 100 nm sub-surface region, attributed to the pinning of geometrically necessary dislocations on nanometric deuterium cavities e signature of plasma-induced defects and deuterium retention. Sub-surface extension of thereby registered plasmainduced damage is in excellent agreement with the results of alternative measurements. The study demonstrates suitability of nano-indentation to probe the impact of deposition of plasma-induced defects in tungsten on near surface plasticity under ITER-relevant plasma exposure conditions.

AB - Surface hardness of tungsten after high flux deuterium plasma exposure has been characterized by nanoindentation. The effect of plasma exposure was rationalized on the basis of available theoretical models. Resistance to plastic penetration is enhanced within the 100 nm sub-surface region, attributed to the pinning of geometrically necessary dislocations on nanometric deuterium cavities e signature of plasma-induced defects and deuterium retention. Sub-surface extension of thereby registered plasmainduced damage is in excellent agreement with the results of alternative measurements. The study demonstrates suitability of nano-indentation to probe the impact of deposition of plasma-induced defects in tungsten on near surface plasticity under ITER-relevant plasma exposure conditions.

KW - Dislocations

KW - Tungsten

KW - Hydroge

KW - Embrittlement

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/22132344

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