Nonlinear Strain Theory of Plastic Flow in Solids

TL;DR

This paper develops a phenomenological Ginzburg-Landau model to describe nonlinear plastic deformation in solids, highlighting how large strains and vacancy distributions lead to heterogeneous, metastable disordered states.

Contribution

It introduces a novel time-dependent Ginzburg-Landau framework for nonlinear plastic flow, including vacancy effects and elastic inhomogeneities, extending previous models.

Findings

Large strains cause dense slip distributions with minimal density deviations.

Vacancy density significantly influences elastic properties and heterogeneity.

Strain-induced disordered states are metastable and long-lived.

Abstract

We present a phenomenological time-dependent Ginzburg-Landau theory of nonlinear plastic deformations in solids. Because the problem is very complex, we first give models in one and two dimensions without vacancies and interstitials, where large strains produce densely distributed slips but the mass density deviations remain small except near the tips of slips. Next we set up a two-dimensional model including a vacancy field (or local free-volume fraction), where relevant is the sensitive dependence of the elastic shear modulus on the vacancy density. In our simulation, if strains are applied to nearly defectless solids but in the presence of such elastic inhomogeneity, the vacancy density and the mass density can become considerably heterogeneous for large strains on spatial scales much longer than the atomic size. These strain-induced disordered states are metastable or long-lived once they are created.