Abstract
In common with all ferritic metals, pure iron is resistant to irradiation induced void swelling, although the reasons for this are not well understood. This paper describes a number of high energy electron irradiations of iron foils, to examine their behaviour in the early stages of damage. The nucleation and growth of dislocation loops has been observed and compared with existing theoretical models. In previous similar experiments only one type of loop has been reported, but in the present study a second set of loop was formed, which grew alongside the first and eventually interacted with them. Although electron irradiations do not necessarily reproduce precisely the effects of neutrons in a reactor, there are nevertheless some wider implications of these results, and in particular the role of interstitial solutes in the swelling resistance of ferritic materials is discussed.
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