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Properties of Dislocation Drag from Phonon Wind at Ambient Conditions

Journal Article · · Materials
DOI:https://doi.org/10.3390/ma12060948· OSTI ID:2373309

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 c T and c T (where c T 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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2373309
Alternate ID(s):
OSTI ID: 1508561
Journal Information:
Materials, Journal Name: Materials Journal Issue: 6 Vol. 12; ISSN 1996-1944; ISSN MATEG9
Publisher:
MDPI AGCopyright Statement
Country of Publication:
Switzerland
Language:
English

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