Thermal Evolution of the Proton Irradiated Structure in Tungsten-5 wt% Tantalum

I. Ipatova, R. W. Harrison, D. Terentyev, S. E. Donnelly, E. Jimenez-Melero

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We have monitored the thermal evolution of the proton irradiated structure of W--5 wt% Ta alloy by in-situ annealing in a transmission electron microscope at fusion reactor temperatures of 500--1300 textdegreeC. The interstitial-type a/2 dislocation loops emit self-interstitial atoms and glide to the free sample surface during the early stages of annealing. The resultant vacancy excess in the matrix originates vacancy-type a/2 dislocation loops that grow by loop and vacancy absorption in the temperature range of 600--900 textdegreeC. Voids form at 1000 textdegreeC, by either vacancy absorption or loop collapse, and grow progressively up to 1300 textdegreeC. Tantalum delays void formation by a vacancy-solute trapping mechanism.
LanguageEnglish
Pages234-239
Number of pages6
JournalJournal of Fusion Energy
Volume36
Issue number6
Early online date11 Nov 2017
DOIs
Publication statusPublished - 1 Dec 2017

Fingerprint

Tantalum
tantalum
Vacancies
Tungsten
Protons
tungsten
protons
voids
interstitials
Annealing
annealing
fusion reactors
Fusion reactors
Dislocations (crystals)
solutes
Electron microscopes
electron microscopes
trapping
Hot Temperature
Atoms

Cite this

Ipatova, I. ; Harrison, R. W. ; Terentyev, D. ; Donnelly, S. E. ; Jimenez-Melero, E. / Thermal Evolution of the Proton Irradiated Structure in Tungsten-5 wt% Tantalum. In: Journal of Fusion Energy. 2017 ; Vol. 36, No. 6. pp. 234-239.
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abstract = "We have monitored the thermal evolution of the proton irradiated structure of W--5 wt{\%} Ta alloy by in-situ annealing in a transmission electron microscope at fusion reactor temperatures of 500--1300 textdegreeC. The interstitial-type a/2 dislocation loops emit self-interstitial atoms and glide to the free sample surface during the early stages of annealing. The resultant vacancy excess in the matrix originates vacancy-type a/2 dislocation loops that grow by loop and vacancy absorption in the temperature range of 600--900 textdegreeC. Voids form at 1000 textdegreeC, by either vacancy absorption or loop collapse, and grow progressively up to 1300 textdegreeC. Tantalum delays void formation by a vacancy-solute trapping mechanism.",
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Thermal Evolution of the Proton Irradiated Structure in Tungsten-5 wt% Tantalum. / Ipatova, I.; Harrison, R. W.; Terentyev, D.; Donnelly, S. E.; Jimenez-Melero, E.

In: Journal of Fusion Energy, Vol. 36, No. 6, 01.12.2017, p. 234-239.

Research output: Contribution to journalArticle

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AB - We have monitored the thermal evolution of the proton irradiated structure of W--5 wt% Ta alloy by in-situ annealing in a transmission electron microscope at fusion reactor temperatures of 500--1300 textdegreeC. The interstitial-type a/2 dislocation loops emit self-interstitial atoms and glide to the free sample surface during the early stages of annealing. The resultant vacancy excess in the matrix originates vacancy-type a/2 dislocation loops that grow by loop and vacancy absorption in the temperature range of 600--900 textdegreeC. Voids form at 1000 textdegreeC, by either vacancy absorption or loop collapse, and grow progressively up to 1300 textdegreeC. Tantalum delays void formation by a vacancy-solute trapping mechanism.

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KW - lattice defects

KW - radiation damage

KW - refractory metals

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