On the temperature and density dependence of dislocation drag from phonon wind

At extreme strain rates, where fast moving dislocations govern plastic deformation, anharmonic phonon scattering imparts a drag force on the dislocations. In this paper, we present calculations of the dislocation drag coefficients of aluminum and copper as functions of temperature and density. We di...

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Bibliographic Details
Published in:Journal of applied physics 2021-07, Vol.130 (1)
Main Authors: Blaschke, Daniel N., Burakovsky, Leonid, Preston, Dean L.
Format: Article
Language:English
Subjects:
Aluminum
Anharmonicity
Dislocation density
Drag
Drag coefficients
Elastic properties
Mathematical analysis
Phonons
Plastic deformation
Temperature dependence
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Summary:At extreme strain rates, where fast moving dislocations govern plastic deformation, anharmonic phonon scattering imparts a drag force on the dislocations. In this paper, we present calculations of the dislocation drag coefficients of aluminum and copper as functions of temperature and density. We discuss the sensitivity of the drag coefficients to changes in the third-order elastic constants with temperature and density.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0054536