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In this work, the interaction of hydrogen with high-angle GBs in nickel has been investigated by means of density functional theory simulations. Two distinct types of GBs have been considered: the Σ3(111)[1¯10] with a close-packed interface structure and the Σ5(210)[001] with a less dense interface structure consisting of open structural units. Our calculations reveal that these two GBs have a markedly...
Tracer self-diffusion is investigated in ultrafine grained Ni prepared by high pressure torsion. Under identical diffusion annealing conditions the ultrafine grained structure of less pure Ni remains stable, while recrystallization and subsequent grain growth occur in high purity Ni. Nevertheless, qualitatively similar ultrafast diffusion rates are measured in the samples of both purity levels. A...
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