Abstract:
The effect of decrease in the strength of submicron-sized specimens of face-centered cubic (fcc) metals with a nanocrystalline structure and a cross-sectional size D<5d, as compared to the strength of the specimens with D≫5d (where d is the grain size), has been considered theoretically on the basis of the dislocation–kinetic equations and relationships. Previously, it has been found that this decrease is caused by the escape of a part of the dislocations through the surface of the specimen under the action of single-pole dislocation sources in grains adjacent to the surface. In this study, it has been shown that the absorption of lattice dislocations by grain boundaries and its accompanying grain boundary sliding lead to a further decrease in the flow stress of specimens, which is equally related to both thin (D<5d) and thick (D≫5d) specimens.
Citation:
G. A. Malygin, “Mechanism of decrease in the strength of submicron-sized specimens of FCC metals with a nanocrystalline structure”, Fizika Tverdogo Tela, 59:2 (2017), 312–317; Phys. Solid State, 59:2 (2017), 321–326
\Bibitem{Mal17}
\by G.~A.~Malygin
\paper Mechanism of decrease in the strength of submicron-sized specimens of FCC metals with a nanocrystalline structure
\jour Fizika Tverdogo Tela
\yr 2017
\vol 59
\issue 2
\pages 312--317
\mathnet{http://mi.mathnet.ru/ftt9679}
\crossref{https://doi.org/10.21883/FTT.2017.02.44054.270}
\elib{https://elibrary.ru/item.asp?id=29006112}
\transl
\jour Phys. Solid State
\yr 2017
\vol 59
\issue 2
\pages 321--326
\crossref{https://doi.org/10.1134/S1063783417020172}
Linking options:
https://www.mathnet.ru/eng/ftt9679
https://www.mathnet.ru/eng/ftt/v59/i2/p312
This publication is cited in the following 1 articles:
E.E. Badiyan, A.G. Tonkopryad, Ye.V. Ftomov, O.V. Shekhovtsov, “STRAIN HARDENING OF FLAT SAMPLES OF TWO-DIMENSIONAL HIGH PURITY Al POLYCRYSTALS”, Problems of Atomic Science and Technology, 2020, 51