Solid-State Transformations Induced by Boundary Migrations

Трусов, Л. И.; Новиков, В. И.; Gryaznov, V. G.

doi:10.1007/978-1-4615-3660-4_6

Cited by 3 publications

(1 citation statement)

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“…A cluster model for nanocrystalline structure was proposed in [17] and developed in [11] and recently in [18]. In the last case it was named bimodal structure model.…”

Section: Diffusion In Consolidated Nanocrystalline Nimentioning

confidence: 99%

Diffusion and Segregation in Bulk Nanomaterials and Thin Layers

Bokstein

Petrova²

2006

DDF

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The data are presented for Ni selfdiffusion and Au heterodiffusion in nanocrystalline Ni. Volume diffusion coefficients are much greater than those for a coarse – grained polycrystals extrapolated from high temperatures. Interface diffusion parameters were calculated based on the assumption that B – kinetic regime is realized at temperature range more than 448 K, while C – kinetic regime is realised at temperatures less than 423 K. The consistency of obtained results with the proposed cluster diffusion model is discussed. Diffusion in Au – Cu thin films (from several tens to several hundreds nanometers) was studied with the use of the Rutherford Back Scattering, RBS, under the kinetic regime B (448 – 523 K). The RBS spectra were transformed in the concentration depth profiles for both volume and grain boundary (GB) diffusion. The triple products Pn = snδDn (sn is the enrichment coefficient, while δ is the nanograin boundary width) were calculated using Whipple model. As a result of this analysis the s – value for Cu – Au system was determined to be of the order of unity. The paper is focused on a difference between GB diffusion parameters in nano – and coarse grained materials.

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“…A cluster model for nanocrystalline structure was proposed in [17] and developed in [11] and recently in [18]. In the last case it was named bimodal structure model.…”

Section: Diffusion In Consolidated Nanocrystalline Nimentioning

confidence: 99%