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The mobility of dislocations is an important factor in understanding materialstrength. Dislocations experience a drag due to their interaction with thecrystal structure, the dominating contribution at high stress and temperaturebeing the scattering off phonons due to phonon wind. Yet, the velocitydependence of this effect has eluded a good theoretical understanding. In aprevious paper, dislocation drag from phonon wind as a function of velocity wascomputed from first principles in the isotropic limit, in part for simplicity,but also arguing that macroscopically, a polycrystalline metal looks isotropic.However, since the single crystal grains are typically a few microns up to amillimeter in size, dislocations travel in single crystals and crossboundaries, but never actually see an isotropic material. In this work wetherefore highlight the effect of crystal anisotropy on dislocation drag byaccounting for the crystal and slip plane geometries. In particular, we keepthe phonon spectrum isotropic for simplicity, but dislocations are modeledaccording to the crystal symmetry (bcc, fcc, hcp, etc.). We then compare to theearlier purely isotropic results, as well as to experimental data and MDsimulations where they are available.

Velocity dependent dislocation drag from phonon wind and crystal geometry