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Title: Properties of Dislocation Drag from Phonon Wind at Ambient Conditions

Abstract

It is well known that, under plastic deformation, dislocations are not only created but also move through the crystal, and their mobility is impeded by their interaction with the crystal structure. At high stress and temperature, this “drag” is dominated by phonon wind, i.e., phonons scattering off dislocations. Employing the semi-isotropic approach discussed in detail in a previous paper (J. Phys. Chem. Solids 2019, 124, 24–35), we discuss here the approximate functional dependence of dislocation drag B on dislocation velocity in various regimes between a few percent of transverse sound speed cT and cT (where cT is the effective average transverse sound speed of the polycrystal). In doing so, we find an effective functional form for dislocation drag B(v) for different slip systems and dislocation characters at fixed (room) temperature and low pressure.

Authors:
ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1508561
Report Number(s):
LA-UR-19-20476
Journal ID: ISSN 1996-1944; MATEG9
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 12; Journal Issue: 6; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; dislocations in crystals; drag coefficient; phonon wind

Citation Formats

Blaschke, Daniel. Properties of Dislocation Drag from Phonon Wind at Ambient Conditions. United States: N. p., 2019. Web. doi:10.3390/ma12060948.
Blaschke, Daniel. Properties of Dislocation Drag from Phonon Wind at Ambient Conditions. United States. doi:10.3390/ma12060948.
Blaschke, Daniel. Thu . "Properties of Dislocation Drag from Phonon Wind at Ambient Conditions". United States. doi:10.3390/ma12060948. https://www.osti.gov/servlets/purl/1508561.
@article{osti_1508561,
title = {Properties of Dislocation Drag from Phonon Wind at Ambient Conditions},
author = {Blaschke, Daniel},
abstractNote = {It is well known that, under plastic deformation, dislocations are not only created but also move through the crystal, and their mobility is impeded by their interaction with the crystal structure. At high stress and temperature, this “drag” is dominated by phonon wind, i.e., phonons scattering off dislocations. Employing the semi-isotropic approach discussed in detail in a previous paper (J. Phys. Chem. Solids 2019, 124, 24–35), we discuss here the approximate functional dependence of dislocation drag B on dislocation velocity in various regimes between a few percent of transverse sound speed cT and cT (where cT is the effective average transverse sound speed of the polycrystal). In doing so, we find an effective functional form for dislocation drag B(v) for different slip systems and dislocation characters at fixed (room) temperature and low pressure.},
doi = {10.3390/ma12060948},
journal = {Materials},
number = 6,
volume = 12,
place = {United States},
year = {2019},
month = {3}
}

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Cited by: 4 works
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    Diffusion and interaction of prismatic dislocation loops simulated by stochastic discrete dislocation dynamics
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