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Characteristic features of diffusion-controlled processes in ordinary and ultrafine-grained polycrystaline metals

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Abstract

An analysis of manifestation of the effect of acceleration of creep in polycrystalline metals and alloys in the presence of grain-boundary diffusion fluxes of an impurity from an external medium (coating) is performed. The influence of the softened (due to impurity diffusion fluxes) layer thickness on the creep character in molybdenum is discussed for the case of its diffusion contact with nickel. An analysis of the effects of the regime of impurity grainboundary diffusion on the value of strain-rate sensitivity and on the behavior of grain-boundary migration as a function of external stress is made. Using submicrocrystalline nickel as an example, the influence of grainboundary state on properties of metallic materials in submicrocrystalline state is investigated. Direct measurements, theoretical calculations and indirect estimations of the differences in grain-boundary diffusion coefficients in coarse- and ultrafine-grained states are performed. The role of dispersion hardening in stabilizing the submicrocrystalline structure and improving the creep resistance is addressed, including the case where the grain-boundary fluxes of impurity atoms are forced from an external medium.

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Authors and Affiliations

  1. Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, Russia

    Yu. R. Kolobov, I. V. Ratochka, K. V. Ivanov & A. G. Lipnitskii

Authors
  1. Yu. R. Kolobov
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  2. I. V. Ratochka
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  3. K. V. Ivanov
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  4. A. G. Lipnitskii
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 49–64, August, 2004.

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Kolobov, Y.R., Ratochka, I.V., Ivanov, K.V. et al. Characteristic features of diffusion-controlled processes in ordinary and ultrafine-grained polycrystaline metals. Russ Phys J 47, 840–856 (2004). https://doi.org/10.1007/s11182-005-0004-6

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  • DOI: https://doi.org/10.1007/s11182-005-0004-6

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