Impact of plastic deformation on plasma induced damage and deuterium retention in tungsten

Research output: Contribution to journalArticle

Institutes & Expert groups

  • UGent - University Ghent - Department of Applied Physics

Abstract

Recent theoretical and subsequent experimental studies suggest that the uptake and release of deuterium (D) in tungsten (W) under high flux ITER-relevant plasma exposure is controlled by dislocation microstructure. Thanks to numerical calculations, a comprehensive mechanism for the nucleation and growth of D bubbles on dislocation network was proposed. The process of bubble nucleation can be described as D atom trapping at a dislocation line, its in-core migration, the coalescence of several D atoms into a multiple cluster eventually transforming into a nano-bubble. This view implies that the initial microstructure might be crucial for D uptake and degradation of the sub-surface layer under prolonged plasma exposure. In this work, we apply several experimental techniques to investigate the microstructure and mechanical properties of surface and sub-surface layer of W in recrystallized and plastically-deformed condition exposed to the high flux plasma. We use transmission and scanning electron microscopy, thermal desorption spectroscopy as well as nano-indentation measurements.

Details

Original languageEnglish
Pages (from-to)3347-3352
Number of pages6
JournalMRS Advances
Volume2
Issue number55
DOIs
StatePublished - 11 Jun 2017

Keywords

  • Strength, thermal stresses, nano-indentation

ID: 3719943