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Journal of Electron Microscopy 48(5): 585-589 (1999)
© 1999 Oxford University Press

Radiation-enhanced precipitation in FeCu(C) alloys studied by electron microscopy

Fuminobu Hori*,, Atsushi Morita1 and Ryuichiro Oshima

Research Institute for Advanced Science and Technology, Osaka Prefecture University 1-2, Gakuen-cho, Sakai, Osaka, 599-8570, Japan
1Graduate School of Engineering, Osaka Prefecture University

*To whom correspondence should be addressed. E-Mail: horif{at}riast.osakafu-u.ac.jp

This study is aimed at understanding the fundamental mechanism of the embrittlement process in low alloy, reactor pressure vessel steel in a neutron irradiation environment. It has previously been considered that the radiation environment may induce the increment of the ductile-brittle transition temperature, which is caused by the fine Cu-precipitation. This is probably based on the interaction between radiation-induced point defects and Cu atoms. In order to study the effect of radiation-induced defects on the Cu precipitation, transmission electron microscopy and positron annihilation measurements were carried out for Fe and FeC alloys after implanting Cu2+ ions with 2.48 MeV. In situ observations of FeCuC alloys were also performed with an ultra-high voltage electron microscope to examine the Cu precipitation processes during electron irradiation. It was found that the mean size of the precipitate is larger than that in pure Fe. This suggests that the growth process of Cu precipitation is enhanced by a small amount of C atoms.

Keywords     Fe-Cu, Fe-Cu-C, ion-implantation, radiation enhanced copper precipitation, electron microscopy, positron annihilation

Received     16 October 1998, accepted 27 April 1999


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