Abstract
The role of defects introduced by both quenching and plastic deformation on the acceleration of surface segregation kinetics in the nickel-sulphur system is discussed. An estimation of the diffusion coefficient of sulphur in as-quenched single-crystal of nickel is given.
Regarding cold-worked structures, the annihilation of the vacancies produces very quick segregation of sulphur atoms on the dislocation network at the beginning of the annealing treatment. However, the diffusion acceleration becomes truly significant when the pipes inside sub-grain boundaries resulting from the deformation are rearranged properly to form a percolated network.
These results demonstrate that the micro-structural evolution of diffusion short circuits should be taken into account when describing complex diffusion kinetics.
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Le Gall, R., Saindrenan, G. Effects of Metastable Diffusion Short-Circuits on Surface Segregation. Interface Science 11, 59–66 (2003). https://doi.org/10.1023/A:1021582823297
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DOI: https://doi.org/10.1023/A:1021582823297