Search

Your search keyword '"Korchuganov, A. V."' showing total 93 results
Start Over Author "Korchuganov, A. V."
93 results on '"Korchuganov, A. V."'

71. Simulation of nanoparticle formation under synchronous electric pulse explosion of metal wires

Author

Zolnikov, Konstantin P., Kryzhevich, Dmitrij S., Korchuganov, Aleksandr V., and Psakhie, Sergey G.

Subjects
Enginyeria dels materials::Metal·lúrgia [Àrees temàtiques de la UPC], Nanoparticle synthesis, Finite element method, Nanopartícules, Conductors, Física::Electromagnetisme::Conductivitat [Àrees temàtiques de la UPC], Elements finits, Mètode dels, Nanoparticles, Electric conductors, Conductors elèctrics, Molecular dynamics, Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC], Electric explosion
Abstract

The paper is devoted to molecular dynamics simulation of the formation of bicomponent nanoparticles in simultaneous electric explosion of copper and nickel conductors. The influence of the distance between conductors on failure dynamics and nanoparticle formation is studied. It is shown that simultaneous electric explosion of metallic conductors makes possible the formation of bicomponent particles. Varying the distance between conductors allows one to control the structure of formed bicomponent particles. An increase in the viscosity of the environment in which conductors are exploded increases the size of formed particles.

Published
2015

72. The role of the excess volume at the nucleation of plastic deformation in metals

Author

Kryzhevich, Dmitrij S., Korchuganov, Aleksandr V., Zolnikov, Konstantin P., and Psakhie, Sergey G.

Subjects
Finite element method, Plasticity, Plasticity -- Mathematical models, Elements finits, Mètode dels, Molecular dynamics, Plasticitat -- Models matemàtics, Matemàtiques i estadística::Anàlisi numèrica::Mètodes en elements finits [Àrees temàtiques de la UPC], Nanoindentation, Enginyeria dels materials::Metal·lúrgia [Àrees temàtiques de la UPC], Condensed Matter::Materials Science, Coure -- Microestructura, Copper crystals, Plasticitat, Physics::Atomic and Molecular Clusters, Plastic deformation, Defects formation
Abstract

The computer simulation results on the atomic structure of the copper crystallite and its behavior in nanoindentation demonstrate the key role of local structural transformations in nucleation of plasticity. The generation of local structural transformations can be considered as an elementary event during the formation of higher scale defects, including partial dislocations and stacking faults. The cause for local structural transformations, both direct fcc-hcp and reverse hcp-fcc, is an abrupt local increase in atomic volume. A characteristic feature is that the values of local volume jumps in direct and reverse structural transformations are comparable with that in melting and lie in the range 5-7 %.

Published
2015

73. Atomic Mechanisms of Plasticity Nucleation in Nanocrystalline Vanadium.

Author

Kryzhevich, D. S., Zolnikov, K. P., and Korchuganov, A. V.

Subjects
MATERIAL plasticity, NUCLEATION, NANOCRYSTALS, VANADIUM, TENSILE strength
Abstract

The features of nucleation and development of plasticity in a nanocrystalline vanadium sample under shear loading are studied. The research is carried out within the framework of the molecular dynamics method. The simulated nanocrystalline sample has grains of approximately equal size with large misorientation angles with respect to each other. Calculations have shown that the nucleation of plasticity is associated with the movement of dislocations from the grain interior to their boundaries and the formation of twins. This leads to an increase in the degree of nonequilibrium of grain boundaries. It is noted that the shear loading forms tensile and compressive stresses at the boundaries and junctions of the grains. Tensile stresses can lead to the formation of micropores in the grain boundary region. The behavior of the crystallite is anisotropic with respect to the direction of shear loading, which is due to the small number of grains in the simulated sample. [ABSTRACT FROM AUTHOR]

Published
2018
Full Text
View/download PDF

81. Grain Boundary Effect on Radiation Damage in Fe-Cr Alloy.

Author

Zolnikova, K. P., Korchuganov, A. V., and Kryzhevich, D. S.

Subjects
*CRYSTAL grain boundaries, *RADIATION damage, *CHROMIUM iron alloys, *MONTE Carlo method, *MOLECULAR dynamics
Abstract

The paper reports on a molecular dynamics and Monte Carlo simulation which unveils the evolution of primary radiation damages in grain boundary regions of Fe-10Cr alloy. The simulation shows that the Cr concentration in the region of grain boundaries is much higher than its average in the grain volume, and this changes the distribution of vacancies survived under irradiation and greatly increases the vacancy fraction in the grain volume compared to the grain boundary region. The segregation of Cr in interface regions can retard the radiation-induced growth of grains. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

91. Investigation of Defect Nucleation in Titanium under Mechanical Loading.

Author

Zolnikov, Konstantin P., Korchuganov, Aleksandr V., Kryzhevich, Dmitrij S., and Psakhie, Sergey G.

Subjects
*NUCLEATION, *TITANIUM, *NANOINDENTATION, *MOLECULAR dynamics, *MATERIAL plasticity, *DEFORMATIONS (Mechanics)
Abstract

The paper undertakes a study of plastic deformation in a titanium crystallite under mechanical loading (uniaxial tension and indentation) in terms of atomic mechanisms of its generation and development. The molecular dynamics method with many-body interatomic potentials is employed. It is shown that there is a threshold strain, at which a crystal reveals the generation of local structural transformations associated with changes in atomic configurations of the first and second coordination spheres. The onset of plastic deformation in a crystallite is accompanied by a stepwise decrease in potential energy. The effect of free surfaces and grain boundaries on the generation of local structural transformations in a titanium crystallite is investigated. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

92. Influence of Crystallographic Orientation on the Response of Copper Crystallites to Nanoindentation.

Author

Korchuganov, Aleksandr V., Kryzhevich, Dmitrij S., Zolnikov, Konstantin P., and Psakhie, Sergey G.

Subjects
*CRYSTALLOGRAPHY, *COPPER crystals, *NANOINDENTATION, *MATERIAL plasticity, *MOLECULAR dynamics, *NUCLEATION, *STRESS relaxation (Mechanics), *ATOMIC interactions
Abstract

Molecular dynamics simulation was performed to study the features of nucleation and development of plastic deformation in copper crystallites in nanoindentation with different crystallographic orientations of their loaded surface: (011), (001), and (111). Atomic interaction was described by a potential constructed in terms of the embedded atom method. It is shown that behavior of the crystallite reaction force correlates well with a change in the fraction of atoms involved in local structural rearrangements. The generation of local structural changes decreases the slope of the crystallite reaction force curve or results in an extremum due to internal stress relaxation. Analysis of structural changes in the material being indented demonstrates that the orientation of its loaded surface greatly affects the features of nucleation and development of plastic deformation. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results