The effect of dense and dilute collision cascades on helium bubbles in metals

S. E. Donnelly, R. C. Birtcher, C. Templier

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The evolution of small helium bubbles in thin gold and aluminum foils has been followed during irradiation with high energy heavy ions (400 keV Ar+ and 200 keV Xe+) using in-situ transmission electron microscopy. Substrate materials were chosen in order that the heavy ion irradiation would produce dilute (aluminum) and dense (gold) collision cascades. Significant differences in bubble behaviour are observed in the two cases, the major effect of dilute cascades being bubble shrinkage due to helium resolution by direct displacement of the gas out of the bubbles. Effects observed for dense cascades, however, include the disappearance and Brownian motion of bubbles under irradiation. The paper will present recent experimental results as well as simple numerical modelling of the observed behaviour. In particular, our interpretation of the dense cascade effects is consistent with the type of displacement and thermal spike processes that recent molecular dynamics simulations have indicated may be important in radiation damage in metals.

LanguageEnglish
Pages583-588
Number of pages6
JournalNuclear Inst. and Methods in Physics Research, B
Volume106
Issue number1-4
DOIs
Publication statusPublished - 2 Dec 1995
Externally publishedYes

Fingerprint

Heavy ions
Helium
cascades
bubbles
Gold
helium
Irradiation
Aluminum foil
collisions
Brownian movement
Radiation damage
Ion bombardment
Metals
metals
Molecular dynamics
Transmission electron microscopy
Aluminum
heavy ions
gold
Computer simulation

Cite this

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abstract = "The evolution of small helium bubbles in thin gold and aluminum foils has been followed during irradiation with high energy heavy ions (400 keV Ar+ and 200 keV Xe+) using in-situ transmission electron microscopy. Substrate materials were chosen in order that the heavy ion irradiation would produce dilute (aluminum) and dense (gold) collision cascades. Significant differences in bubble behaviour are observed in the two cases, the major effect of dilute cascades being bubble shrinkage due to helium resolution by direct displacement of the gas out of the bubbles. Effects observed for dense cascades, however, include the disappearance and Brownian motion of bubbles under irradiation. The paper will present recent experimental results as well as simple numerical modelling of the observed behaviour. In particular, our interpretation of the dense cascade effects is consistent with the type of displacement and thermal spike processes that recent molecular dynamics simulations have indicated may be important in radiation damage in metals.",
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The effect of dense and dilute collision cascades on helium bubbles in metals. / Donnelly, S. E.; Birtcher, R. C.; Templier, C.

In: Nuclear Inst. and Methods in Physics Research, B, Vol. 106, No. 1-4, 02.12.1995, p. 583-588.

Research output: Contribution to journalArticle

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AU - Templier, C.

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AB - The evolution of small helium bubbles in thin gold and aluminum foils has been followed during irradiation with high energy heavy ions (400 keV Ar+ and 200 keV Xe+) using in-situ transmission electron microscopy. Substrate materials were chosen in order that the heavy ion irradiation would produce dilute (aluminum) and dense (gold) collision cascades. Significant differences in bubble behaviour are observed in the two cases, the major effect of dilute cascades being bubble shrinkage due to helium resolution by direct displacement of the gas out of the bubbles. Effects observed for dense cascades, however, include the disappearance and Brownian motion of bubbles under irradiation. The paper will present recent experimental results as well as simple numerical modelling of the observed behaviour. In particular, our interpretation of the dense cascade effects is consistent with the type of displacement and thermal spike processes that recent molecular dynamics simulations have indicated may be important in radiation damage in metals.

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