Dislocation drag from phonon wind in an isotropic crystal at large velocities
Abstract
The anharmonic interaction and scattering of phonons by a moving dislocation, the photon wind, imparts a drag force $vB$ $(ν, T, ρ)$ on the dislocation. In early studies the drag coefficient B was computed and experimentally determined only for dislocation velocities v much less than transverse sound speed, $$c_T$$ . In this paper we derive analytic expressions for the velocity dependence of B up to $$c_T$$ in terms of the third-order continuum elastic constants of an isotropic crystal, in the continuum Debye approximation, valid for dislocation velocities approaching the sound speed. In so doing we point out that the most general form of the third order elastic potential for such a crystal and the dislocation-phonon interaction requires two additional elastic constants involving asymmetric local rotational strains, which have been neglected previously. We compute the velocity dependence of the transverse phonon wind contribution to B in the range 1%–90% $$c_T$$ for Al, Cu, Fe, and Nb in the isotropic Debye approximation. The drag coefficient for transverse phonons scattering from screw dislocations is finite as $$ν → c_T$$ , whereas B is divergent for transverse phonons scattering from edge dislocations in the same limit. This divergence indicates the breakdown of the Debye approximation and sensitivity of the drag coefficient at very high velocities to the microscopic crystalline lattice cutoff. We compare our results to experimental results wherever possible and identify ways to validate and further improve the theory of dislocation drag at high velocities with realistic phonon dispersion relations, inclusion of lattice cutoff effects, MD simulation data, and more accurate experimental measurements.
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1604033
- Report Number(s):
- LA-UR-19-25851
Journal ID: ISSN 1478-6435; TRN: US2104183
- Grant/Contract Number:
- 89233218CNA000001
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Philosophical Magazine (2003, Print)
- Additional Journal Information:
- Journal Name: Philosophical Magazine (2003, Print); Journal Volume: 100; Journal Issue: 5; Journal ID: ISSN 1478-6435
- Publisher:
- Taylor & Francis
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Dislocations in crystals; drag coefficient; phonon wind
Citation Formats
Blaschke, Daniel N., Mottola, Emil, and Preston, Dean L. Dislocation drag from phonon wind in an isotropic crystal at large velocities. United States: N. p., 2019.
Web. doi:10.1080/14786435.2019.1696484.
Blaschke, Daniel N., Mottola, Emil, & Preston, Dean L. Dislocation drag from phonon wind in an isotropic crystal at large velocities. United States. https://doi.org/10.1080/14786435.2019.1696484
Blaschke, Daniel N., Mottola, Emil, and Preston, Dean L. Wed .
"Dislocation drag from phonon wind in an isotropic crystal at large velocities". United States. https://doi.org/10.1080/14786435.2019.1696484. https://www.osti.gov/servlets/purl/1604033.
@article{osti_1604033,
title = {Dislocation drag from phonon wind in an isotropic crystal at large velocities},
author = {Blaschke, Daniel N. and Mottola, Emil and Preston, Dean L.},
abstractNote = {The anharmonic interaction and scattering of phonons by a moving dislocation, the photon wind, imparts a drag force $vB$ $(ν, T, ρ)$ on the dislocation. In early studies the drag coefficient B was computed and experimentally determined only for dislocation velocities v much less than transverse sound speed, $c_T$ . In this paper we derive analytic expressions for the velocity dependence of B up to $c_T$ in terms of the third-order continuum elastic constants of an isotropic crystal, in the continuum Debye approximation, valid for dislocation velocities approaching the sound speed. In so doing we point out that the most general form of the third order elastic potential for such a crystal and the dislocation-phonon interaction requires two additional elastic constants involving asymmetric local rotational strains, which have been neglected previously. We compute the velocity dependence of the transverse phonon wind contribution to B in the range 1%–90% $c_T$ for Al, Cu, Fe, and Nb in the isotropic Debye approximation. The drag coefficient for transverse phonons scattering from screw dislocations is finite as $ν → c_T$ , whereas B is divergent for transverse phonons scattering from edge dislocations in the same limit. This divergence indicates the breakdown of the Debye approximation and sensitivity of the drag coefficient at very high velocities to the microscopic crystalline lattice cutoff. We compare our results to experimental results wherever possible and identify ways to validate and further improve the theory of dislocation drag at high velocities with realistic phonon dispersion relations, inclusion of lattice cutoff effects, MD simulation data, and more accurate experimental measurements.},
doi = {10.1080/14786435.2019.1696484},
journal = {Philosophical Magazine (2003, Print)},
number = 5,
volume = 100,
place = {United States},
year = {Wed Dec 25 00:00:00 EST 2019},
month = {Wed Dec 25 00:00:00 EST 2019}
}
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Works referencing / citing this record:
Analytic model of the remobilization of pinned glide dislocations: Including dislocation drag from phonon wind
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