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Journal of Electron Microscopy 51:S245-S251 (2002)
© 2002 Oxford University Press

Full-length paper

Quantitative study of Brownian motion of helium bubbles in fcc metals

Kotaro Ono1,*, Kazuto Arakawa1, Kiichi Hojou2, Masahiro Oohasi1, Robert C. Birtcher3 and Stephen E. Donnelly4

1Department of Materials Science, Shimane University, Matsue 690-8504, Japan,
2Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan,
3Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439-4838, USA and
4Department of Physics, University of Salford, Salford M54WT, UK

To whom correspondence should be addressed. E-mail: onokotar{at}riko.shimane-u.ac.jp

Dynamical process of helium bubbles in face-centred cubic (fcc) metals has been studied by in situ irradiation and electron microscopy with a video recording system. Brownian type motion of helium bubbles was demonstrated quantitatively by establishing a proportional relation between the mean square of the bubble migration distance and time. This relation yielded the diffusion coefficient of the bubble. Examples of Brownian motion in the matrix and along general grain boundaries in pure aluminium are shown comparatively. Similar Brownian motion was also observed in an Fe-16Cr-17Ni austenitic alloy. It was revealed from scanning transmission electron microscopy–electron energy-loss spectroscopy that Cr was depleted around the bubble surface, but Ni was enriched. Response of the bubble motion to irradiation with high-energy self-ions was examined in pure aluminium and both effects of enhancement and retardation of the bubble mobility were found.

Keywords     helium bubble, diffusion, ion irradiation, in situ electron microscopy, aluminium, austenitic alloy


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