Abstract
Abstract An electron microscope study has been made of the time-dependent annealing behaviour of interstitial loops in impure and pure molybdenum neutron-irradiated at 77°K (A77 and C77) respectively and of vacancy loops in pure molybdenum neutron-irradiated at 473°K (C473). The results have been quantitatively analysed and loop growth behaviour has been compared with that predicted theoretically for perfect loops growing by bulk vacancy-limited diffusion mechanism and by a glide and self-climb mechanism. It has been shown that the interstitial loop growth observed in A77 and C77 is accounted for by a glide and self-climb mechanism. On the other hand, vacancy loop growth observed in C473 can be accounted for by a bulk vacancy diffusion mechanism although it is considered that both mechanisms contribute to the observed growth at intermediate stages of the anneal. Finally, two general distinguishing features of loop growth have been exposed. Firstly, under bulk vacancy diffusion-limiting conditions, interst...
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