Abstract
Atomic mechanisms of selfdiffusion in Ni3A1 are theoretically studied. Available experimental data on Ni diffusion are shown to be generally consistent with a model of Ni vacancy movements in the Ni sublattice. At present, the problem of Al self-diffusion cannot be certainly clarified owing to a lack of reliable experimental data. A model of Al atom diffusion by anti-structure defects via so-called anti-structure bridges is suggested. The contribution of anti-structure defects increases with a deviation from the stoichiometric composition and strongly depends on the long-range order. A modified approach to calculate equilibrium defect concentrations is considered and the effect of ordering on Al diffusion is investigated.
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Divinski, S.V., Larikov, L.N., Shmatko, O.A. (1998). Atomic Mechanisms of Diffusion in Ni3Al. In: Ciach, R. (eds) Advanced Light Alloys and Composites. NATO ASI Series, vol 59. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-9068-6_7
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DOI: https://doi.org/10.1007/978-94-015-9068-6_7
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