Impact of plastic deformation on plasma induced damage and deuterium retention in tungsten. (15th June 2017)

• Record Type: Journal Article
• Authors: Bakaeva, A.; Terentyev, D.; Dubinko, A.
• Is Part Of: MRS advances. Volume 2:Number 55(2017)
• Page Start: 3347
• Page End: 3352
• Publication Date: 2017-06-15
• Subjects: strength, -- thermal stresses, -- nano-indentation; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/adv.2017.428
• Languages: English
• ISSNs: 2059-8521

Abstract

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.