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Dynamics and Kinetics of Dislocations in Metals and Alloys Under Dynamic Loading

Published online by Cambridge University Press:  05 April 2013

Denis Ilnitski ,
Vasily Krasnikov ,
Alexey Kuksin ,
Alexander Mayer  and
Alexey Yanilkin
Denis Ilnitski
Affiliation:
All-Russia Research Institute of Automatics, Moscow, 22 Sushchevskaya, 127055, Russian Federation
Vasily Krasnikov
Affiliation:
South Ural State University, pr. Lenina 76, Chelyabinsk, 454080, Russian Federation
Alexey Kuksin
Affiliation:
Joint Institute for High Temperatures of Russian Academy of Sciences, 13 Izhorskaya, Bld.2, 125412, Russian Federation Moscow Institute of Physics and Technology, 8 Institutski per., Dolgoprudny, 141700, Russian Federation
Alexander Mayer
Affiliation:
Chelyabinsk State University, 129 Brat’ev Kashirinykh, Chelyabinsk, 454001, Russian Federation
Alexey Yanilkin
Affiliation:
All-Russia Research Institute of Automatics, Moscow, 22 Sushchevskaya, 127055, Russian Federation Joint Institute for High Temperatures of Russian Academy of Sciences, 13 Izhorskaya, Bld.2, 125412, Russian Federation
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Abstract

The work presented is devoted to study the mechanisms and kinetics of plastic deformation of bcc and fcc metals and alloys under shock-wave loading (strain rates > 105 s-1). To study the behavior of metals under conditions described the two scale approach is developed. It comprises molecular dynamics (MD) calculations of dislocation mobility and dislocations nucleation rate and continuum mechanics model with equations for description of elastoplastic deformation, kinetics and dynamics of dislocations.

Dislocation velocities as functions of applied shear stress are calculated from MD in a wide temperature range up to the melting point. Velocity-dependent drag coefficient is introduced to approximate the data obtained.

The influence of Guinier–Preston (GP) zones on dislocation motion is analyzed. The results obtained are used to evaluate temperature dependence of dynamic flow stress and the evolution of dislocations subsystem under shock loading. Data on the attenuation of the elastic precursor and rare surface velocity profiles calculated for Al are in good agreement with the experiments. Simulation of the free surface velocity profiles during shock-wave loading of AlCu alloys is carried out.

Keywords

simulationmetalstress/strain relationship
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1535: Symposium a – Proceedings of the Multiscale Materials Modeling 2012 Conference , 2013 , mmm2012-a-0305
Copyright
Copyright © Materials Research Society 2013 

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References

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