Structural defect accumulation in tungsten and tungsten-5wt.% tantalum under incremental proton damage

I. Ipatova, R.W. Harrison, P.T. Wady, S.M. Shubeita, D. Terentyev, S.E. Donnelly, E. Jimenez-Melero

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We have performed proton irradiation of W and W-5wt.%Ta materials at 350 °C with a step-wise damage level increase up to 0.7 dpa and using two beam energies, namely 40 keV and 3 MeV, in order to probe the accumulation of radiation-induced lattice damage in these materials. Interstitial-type a/2 <111> dislocation loops are formed under irradiation, and their size increases in W-5Ta up to a loop width of 21 ± 4 nm at 0.3 dpa, where loop saturation takes place. In contrast, the loop length in W increases progressively up to 183 ± 50 nm at 0.7 dpa, whereas the loop width remains relatively constant at 29 ± 7 nm at >0.3 dpa, giving rise to dislocation strings. The dislocation loops and tangles are observed in both materials examined after a 3 MeV proton irradiation at 350 °C. Ta doping delays the evolution of radiation-induced dislocation structures in W, and can consequently impact the hydrogen isotope retention under plasma exposure.

LanguageEnglish
Pages329-335
Number of pages7
JournalJournal of Nuclear Materials
Volume501
Early online date29 Dec 2017
DOIs
Publication statusPublished - 1 Apr 2018

Fingerprint

proton damage
Tantalum
Tungsten
tantalum
Proton irradiation
Protons
tungsten
Defects
defects
Radiation
proton irradiation
Isotopes
Hydrogen
Doping (additives)
Irradiation
damage
Plasmas
hydrogen isotopes
radiation
interstitials

Cite this

Ipatova, I. ; Harrison, R.W. ; Wady, P.T. ; Shubeita, S.M. ; Terentyev, D. ; Donnelly, S.E. ; Jimenez-Melero, E. / Structural defect accumulation in tungsten and tungsten-5wt.% tantalum under incremental proton damage. In: Journal of Nuclear Materials. 2018 ; Vol. 501. pp. 329-335.
@article{863fbf7f947a47af89ef18547f2555cf,
title = "Structural defect accumulation in tungsten and tungsten-5wt.{\%} tantalum under incremental proton damage",
abstract = "We have performed proton irradiation of W and W-5wt.{\%}Ta materials at 350 °C with a step-wise damage level increase up to 0.7 dpa and using two beam energies, namely 40 keV and 3 MeV, in order to probe the accumulation of radiation-induced lattice damage in these materials. Interstitial-type a/2 <111> dislocation loops are formed under irradiation, and their size increases in W-5Ta up to a loop width of 21 ± 4 nm at 0.3 dpa, where loop saturation takes place. In contrast, the loop length in W increases progressively up to 183 ± 50 nm at 0.7 dpa, whereas the loop width remains relatively constant at 29 ± 7 nm at >0.3 dpa, giving rise to dislocation strings. The dislocation loops and tangles are observed in both materials examined after a 3 MeV proton irradiation at 350 °C. Ta doping delays the evolution of radiation-induced dislocation structures in W, and can consequently impact the hydrogen isotope retention under plasma exposure.",
keywords = "Refractory metals, Binary alloys, Dislocation analysis, Proton irradiation, Transmission electron microscopy",
author = "I. Ipatova and R.W. Harrison and P.T. Wady and S.M. Shubeita and D. Terentyev and S.E. Donnelly and E. Jimenez-Melero",
year = "2018",
month = "4",
day = "1",
doi = "10.1016/j.jnucmat.2017.11.030",
language = "English",
volume = "501",
pages = "329--335",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",

}

Structural defect accumulation in tungsten and tungsten-5wt.% tantalum under incremental proton damage. / Ipatova, I.; Harrison, R.W.; Wady, P.T.; Shubeita, S.M.; Terentyev, D.; Donnelly, S.E.; Jimenez-Melero, E.

In: Journal of Nuclear Materials, Vol. 501, 01.04.2018, p. 329-335.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Structural defect accumulation in tungsten and tungsten-5wt.% tantalum under incremental proton damage

AU - Ipatova, I.

AU - Harrison, R.W.

AU - Wady, P.T.

AU - Shubeita, S.M.

AU - Terentyev, D.

AU - Donnelly, S.E.

AU - Jimenez-Melero, E.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - We have performed proton irradiation of W and W-5wt.%Ta materials at 350 °C with a step-wise damage level increase up to 0.7 dpa and using two beam energies, namely 40 keV and 3 MeV, in order to probe the accumulation of radiation-induced lattice damage in these materials. Interstitial-type a/2 <111> dislocation loops are formed under irradiation, and their size increases in W-5Ta up to a loop width of 21 ± 4 nm at 0.3 dpa, where loop saturation takes place. In contrast, the loop length in W increases progressively up to 183 ± 50 nm at 0.7 dpa, whereas the loop width remains relatively constant at 29 ± 7 nm at >0.3 dpa, giving rise to dislocation strings. The dislocation loops and tangles are observed in both materials examined after a 3 MeV proton irradiation at 350 °C. Ta doping delays the evolution of radiation-induced dislocation structures in W, and can consequently impact the hydrogen isotope retention under plasma exposure.

AB - We have performed proton irradiation of W and W-5wt.%Ta materials at 350 °C with a step-wise damage level increase up to 0.7 dpa and using two beam energies, namely 40 keV and 3 MeV, in order to probe the accumulation of radiation-induced lattice damage in these materials. Interstitial-type a/2 <111> dislocation loops are formed under irradiation, and their size increases in W-5Ta up to a loop width of 21 ± 4 nm at 0.3 dpa, where loop saturation takes place. In contrast, the loop length in W increases progressively up to 183 ± 50 nm at 0.7 dpa, whereas the loop width remains relatively constant at 29 ± 7 nm at >0.3 dpa, giving rise to dislocation strings. The dislocation loops and tangles are observed in both materials examined after a 3 MeV proton irradiation at 350 °C. Ta doping delays the evolution of radiation-induced dislocation structures in W, and can consequently impact the hydrogen isotope retention under plasma exposure.

KW - Refractory metals

KW - Binary alloys

KW - Dislocation analysis

KW - Proton irradiation

KW - Transmission electron microscopy

UR - http://www.scopus.com/inward/record.url?scp=85041447169&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2017.11.030

DO - 10.1016/j.jnucmat.2017.11.030

M3 - Article

VL - 501

SP - 329

EP - 335

JO - Journal of Nuclear Materials

T2 - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

ER -