Evolution of Metal Structure at Intense Plastic Strains: Molecular Dynamics Simulation

TL;DR

This paper uses molecular dynamics simulations to study how dislocation structures evolve under intense plastic strains, revealing their different states and roles in grain boundary formation.

Contribution

It introduces a detailed simulation-based analysis of dislocation structural states and their impact on microstructure evolution during intense plastic deformation.

Findings

Dislocations have multiple structural states.

Dislocations with micropores influence boundary formation.

Elastic and inelastic strain stages alternate during deformation.

Abstract

The kinetics of dislocations is studied with computer simulation at loadings of different intensity. It is established that the dislocations have a few different structural states. The dislocations "with the micropore" play important role in the formation of large curved boundaries, and, as a consequence, in the formation of fine grains. Alternation of elastic and inelastic strain stages is established too. At shear loading, in view of special kinetics, the system would have to accumulate the whole set of dislocations leading to the formation of new boundaries and fine grains.