Random Organization in Periodically Driven Gliding Dislocations

TL;DR

This paper investigates how periodically driven dislocation assemblies in materials undergo transitions from irreversible to reversible states, revealing random organization phenomena and pattern formation at critical driving amplitudes.

Contribution

It introduces a numerical study of dislocation dynamics under periodic driving, applying a protocol from colloidal physics to identify random organization in dislocation systems.

Findings

Dislocations exhibit features of random organization.

Transient time diverges at a critical shear amplitude.

Reversible states feature patterned domain wall structures.

Abstract

We numerically examine dynamical irreversible to reversible transitions and random organization for periodically driven gliding dislocation assemblies using the stroboscopic protocol developed to identify random organization in periodically driven dilute colloidal suspensions. We find that the gliding dislocations exhibit features associated with random organization and evolve into a dynamically reversible state after a transient time extending over a number of cycles. At a critical shearing amplitude, the transient time diverges. When the dislocations enter the reversible state they organize into patterns with fragmented domain wall type features.