Abstract
The nucleation and growth of helium bubbles in a 12% Cr ferritic stainless steel has been investigated by ion implantation and subsequent annealing using transmission electron microscopy. Bubble growth in the temperature range 600–850°C is slower than was anticipated, in part because, with a high bubble density, growth by vacancy collection is not diffusion-limited but is controlled by vacancy source or sink behaviour. Migration and coalescence is found to be the dominant growth mechanism even at temperatures in excess of 0.6 T m .
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