Title :

Interaction of transmutation products with precipitates, dislocations and grain boundaries in neutron irradiated W

Author(s) :

Lloyd, M.J. [Auteur]
Singapore University of Technology and Design [SUTD]
University of Oxford
Culham Centre for Fusion Energy [CCFE]
London, A.J. [Auteur]
Culham Centre for Fusion Energy [CCFE]
Haley, J.C. [Auteur]
University of Oxford
Culham Centre for Fusion Energy [CCFE]
Gilbert, M.R. [Auteur]
Culham Centre for Fusion Energy [CCFE]
Becquart, Charlotte [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Domain, Christophe [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Martinez, E. [Auteur]
Clemson University
Moody, M.P. [Auteur]
University of Oxford
Bagot, P.A.J. [Auteur]
University of Oxford
Nguyen-Manh, D. [Auteur]
University of Oxford
Culham Centre for Fusion Energy [CCFE]
Armstrong, D.E.J. [Auteur]
University of Oxford

Journal title :

Materialia

Pages :

101370

Publisher :

Elsevier BV

Publication date :

2022-05

ISSN :

2589-1529

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]

English abstract : [en]

Tungsten is the primary candidate materials for the high neutron flux, high temperature components of a future demonstration fusion reactor. Despite this, there is a lack of data on W under fusion relevant neutron doses ...
Show more >Tungsten is the primary candidate materials for the high neutron flux, high temperature components of a future demonstration fusion reactor. Despite this, there is a lack of data on W under fusion relevant neutron doses and irradiation temperatures. In this study, single crystal and polycrystalline W samples irradiated at the High Flux Reactor (HFR) at 900 C were characterised using Atom Probe Tomography (APT) and Scanning Transmission Electron Microscopy (STEM). Bulk chemical and isotopic concentration predictions were validated by analysing the mass spectrum from APT experiments. A post irradiation composition of W-1.26 0.15 at.%Re - 0.08 0.02 at.%Os - 0.01 0.01 at.%Ta was measured in the single crystal sample, whereas W-1.09 0.07 at.%Re - 0.08 0.02 at.%Os - 0.01 0.01 at.%Ta was measured for the polycrystalline. APT and STEM showed that a high number density of Re and Os rich precipitates had formed under neutron irradiation. These typically consisted of a core rich in Re and Os, surrounded by a less dense Re rich cloud. Multiple analysis methods were applied to investigate the composition of these clusters. APT showed that the centres of some of the precipitates had a rod shaped core which were rich in both Re and Os. Line profile analysis suggests that in the centre of the precipitates, the threshold composition for phase formation may have been reached, as has been observed in higher transmutation rate experiments. In addition, dislocations, sub grain boundaries and dislocation loops were all shown to be decorated with both Re and Os, in agreement with predictions from DFT simulations.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRA
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Métallurgie Physique et Génie des Matériaux

Submission date :

2022-04-01T10:02:03Z