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

TY - JOUR

T1 - Impact of plastic deformation on plasma induced damage and deuterium retention in tungsten

AU - Bakaeva, Anastasiia

AU - Terentyev, Dmitry

AU - Dubinko, Andrii

N1 - Score=10

PY - 2017/6/11

Y1 - 2017/6/11

N2 - 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.

AB - 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.

KW - Strength

KW - thermal stresses

KW - nano-indentation

UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/27767354

U2 - 10.1557/adv.2017.428

DO - 10.1557/adv.2017.428

M3 - Article

VL - 2

SP - 3347

EP - 3352

JO - MRS Advances

JF - MRS Advances

SN - 2059-8521

IS - 55

ER -