Temperature threshold for preferential bubble formation on grain boundaries in tungsten under in-situ helium irradiation

El-Atwani, O.; Cunningham, W. S.; Perez, D.; Martinez, E.; Trelewicz, J. R.; Li, M.; Maloy, S. A.

doi:10.1016/j.scriptamat.2020.01.013

Title: Temperature threshold for preferential bubble formation on grain boundaries in tungsten under in-situ helium irradiation

Journal Article · 27 January 2020 · Scripta Materialia

DOI: https://doi.org/10.1016/j.scriptamat.2020.01.013 · OSTI ID:1641728

El-Atwani, O. ^[1];

^[2]; Perez, D. ^[1]; Martinez, E. ^[1];

^[2]; Li, M. ^[3]; Maloy, S. A. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Stony Brook Univ., NY (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Understanding a material's radiation tolerance requires examining its performance under different irradiation conditions. In this work, we investigate the radiation tolerance in terms of helium bubble damage in tungsten irradiated in-situ with 16 keV helium at 1073 K and 1223 K. Damage evolution represented by helium bubble density, size and total change in volume in the grain matrices and the grain boundaries are quantified as a function of fluence. Preferential large bubble formation and a higher change in volume on the grain boundaries occurred at 1223 K, suggesting faster migration of certain helium-vacancy complexes as confirmed by a diffusion-reaction model.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy; USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF); G. T. Seaborg In- stitute; USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC)

Grant/Contract Number:: AC02-06CH11357; AC07-05ID14517; 1810040; SC0008875; 89233218CNA000001

OSTI ID:: 1641728

Alternate ID(s):: OSTI ID: 1595165; OSTI ID: 1657131

Report Number(s):: LA-UR-19-29529; 160843

Journal Information:: Scripta Materialia, Vol. 180; ISSN 1359-6462

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Grain boundaries
Implantation
In-situ
Helium-vacancy complexes
Electron microscopy

Title: Temperature threshold for preferential bubble formation on grain boundaries in tungsten under in-situ helium irradiation

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