Analytic model of the remobilization of pinned glide dislocations: including dislocation drag from phonon wind

Abstract

In this paper we discuss the effect of a non-constant dislocation drag coefficient on the very high strain rate regime within an analytic model describing mobile-immobile dislocation intersections applicable to polycrystals. Based on previous work on dislocation drag, we estimate its temperature and pressure dependence and its effects on stress-strain rate relations. In the high temperature regime, we show that drag can remain the dominating effect even down to intermediate strain rates. We also discuss the consequences of having a limiting dislocation velocity, a feature which is typically predicted by analytic models of dislocation drag, but which is somewhat under debate because a number of MD simulations predict supersonic dislocations.

arXiv comment26 pages, 11 figures; v2 minor revision

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• How to determine limiting velocities of dislocations in anisotropic crystals
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• A general solution for accelerating screw dislocations in arbitrary slip systems with reflection symmetry
• Comparing theoretical predictions of radiation-free velocities of edge dislocations to molecular dynamics simulations
• Properties of accelerating edge dislocations in arbitrary slip systems with reflection symmetry
• Filling a gap in materials mechanics: Nanoindentation at high constant strain rates upto $10^5{s}^{-1}$
• Defect dependent dynamic nanoindentation hardness of copper up to 25 000 s-1