Effect of the severe plastic deformation temperature on the diffusion properties of the grain boundaries in ultrafine-grained metals
- Authors: Chuvil’deev V.N.1, Myshlyaev M.M.2,3, Nokhrin A.V.1, Kopylov V.I.1,4, Lopatin Y.G.1, Pirozhnikova O.E.1, Piskunov A.V.1, Semenycheva A.V.1, Bobrov A.A.1
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Affiliations:
- Nizhny Novgorod State University
- Baikov Institute of Metallurgy and Materials Science
- Institute of Solid State Physics
- Physicotechnical Institute
- Issue: Vol 2017, No 5 (2017)
- Pages: 413-425
- Section: Article
- URL: https://journals.rcsi.science/0036-0295/article/view/171503
- DOI: https://doi.org/10.1134/S0036029517050044
- ID: 171503
Cite item
Abstract
A model is proposed to explain the effect of the severe plastic deformation (SPD) temperature on the diffusion properties of the grain boundaries in ultrafine-grained (UFG) metals and alloys. It is shown that an increase in the SPD temperature in UFG metals leads to an increase in the activation energy of grainboundary diffusion from (3–5)kBTm, which corresponds to the diffusion parameters of nonequilibrium grain boundaries, to (8–10)kBTm, which corresponds to the diffusion parameters of equilibrium grain boundaries (kB is the Boltzmann constant, Tm is the melting temperature). The dependence of the activation energy of grain-boundary diffusion on the SPD temperature is found to be determined by the kinetics of the competing processes of defect accumulation at grain boundaries and the diffusion accommodation of defects.
About the authors
V. N. Chuvil’deev
Nizhny Novgorod State University
Email: nokhrin@nifti.unn.ru
Russian Federation, pr. Gagarina 23/5, Nizhny Novgorod, 603950
M. M. Myshlyaev
Baikov Institute of Metallurgy and Materials Science; Institute of Solid State Physics
Email: nokhrin@nifti.unn.ru
Russian Federation, Leninskii pr. 49, Moscow, 119991; Chernogolovka, Moscow oblast, 142432
A. V. Nokhrin
Nizhny Novgorod State University
Author for correspondence.
Email: nokhrin@nifti.unn.ru
Russian Federation, pr. Gagarina 23/5, Nizhny Novgorod, 603950
V. I. Kopylov
Nizhny Novgorod State University; Physicotechnical Institute
Email: nokhrin@nifti.unn.ru
Russian Federation, pr. Gagarina 23/5, Nizhny Novgorod, 603950; ul. Tskhodinskaya 4, Minsk, 220141
Yu. G. Lopatin
Nizhny Novgorod State University
Email: nokhrin@nifti.unn.ru
Russian Federation, pr. Gagarina 23/5, Nizhny Novgorod, 603950
O. E. Pirozhnikova
Nizhny Novgorod State University
Email: nokhrin@nifti.unn.ru
Russian Federation, pr. Gagarina 23/5, Nizhny Novgorod, 603950
A. V. Piskunov
Nizhny Novgorod State University
Email: nokhrin@nifti.unn.ru
Russian Federation, pr. Gagarina 23/5, Nizhny Novgorod, 603950
A. V. Semenycheva
Nizhny Novgorod State University
Email: nokhrin@nifti.unn.ru
Russian Federation, pr. Gagarina 23/5, Nizhny Novgorod, 603950
A. A. Bobrov
Nizhny Novgorod State University
Email: nokhrin@nifti.unn.ru
Russian Federation, pr. Gagarina 23/5, Nizhny Novgorod, 603950