Microstructural modifications in tungsten induced by high flux plasma esposure: TEM examination

Research output: Contribution to report/book/conference proceedingsIn-proceedings paper

Authors

Institutes & Expert groups

  • CIEMAT - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
  • ITER - Organization - France
  • UGent - Universiteit Gent

Documents & links

Abstract

We have performed microstructural characterization using transmission electron microscopy (TEM) techniques to reveal nanometric features in the sub-surface region of tungsten samples exposed to high flux, low energy deuterium plasma. TEM examination revealed formation of a dense dislocation network and dislocation tangles, overall resulting in a strong increase in the dislocation density by at least one order of magnitude as compared to the initial one. Plasmainduced dislocation microstructure vanishes beyond a depth of about 10 μm from the top of the exposed surface where the dislocation density and its morphology becomes comparable to the reference microstructure. Interstitial edge dislocation loops with Burgers vector a0/2〈111〉 and a0〈100〉 were regularly observed within 6 μm of the sub-surface region of the exposed samples, but absent in the reference material. The presence of these loops points to a co-existence of nanometric D bubbles, growing by loop punching mechanism, and sub-micron deuterium flakes, resulting in the formation of surface blisters, also observed here by scanning electron microscopy.

Details

Original languageEnglish
Title of host publicationPhysica Scripta
PublisherIOP Publishing Ltd.
Pages71-83
VolumeT167
Edition2016
DOIs
Publication statusPublished - 20 Feb 2016
EventPFMC 2015 - 15th international conference on Plasma-facing materials and components for fusion applications - Aix-en-Provence, France
Duration: 18 May 201522 May 2015
http://www.materials.cea.fr/en/Phocea/Vie_des_labos/Seminaires/index.php?id=28

Publication series

NameRoyal Swedish Academy of Science - Physica Scripta
PublisherIOP Publishing
Number014030
VolumeT167
ISSN (Print)0031-8949

Conference

ConferencePFMC 2015 - 15th international conference on Plasma-facing materials and components for fusion applications
CountryFrance
CityAix-en-Provence
Period2015-05-182015-05-22
Internet address

Keywords

  • tungsten, High flux plasma, dislocations

ID: 2179010