Dynamical Effects of Driven Dislocation Glide through Local Pinnings

TL;DR

This paper investigates how dislocation inertia influences driven dislocation glide through local pinnings, revealing temperature-dependent effects and non-Arrhenius behavior using a stochastic computational model.

Contribution

It introduces a stochastic model to analyze the impact of dislocation inertia on glide dynamics and depinning rates under various stress and temperature conditions.

Findings

Dislocation inertia affects global velocity at higher stresses.

Temperature sensitivity of dislocation motion is strongly non-Arrhenius.

Lower temperatures extend local kinetic energy correlations, enhancing depinning rates.

Abstract

We present effects of dislocation inertia on the driven dislocation glide through local immobile pinnings using a stochastic computational model. The global dislocation velocity at a higher stress range is found noticeably dependent on the dislocation inertia, and the temperature sensitivity is observed to be strongly non-Arrhenius. The statistical analysis indicates that the correlation of the local dislocation kinetic energy is extended at a lower temperature, which results in the enhanced depinning rate by the inertia effect.