Plastic flow in polycrystal states in a binary mixture

Abstract

Using molecular dynamics simulation we examine dynamics in sheared polycrystal states in a binary mixture containing 10% larger particles in two dimensions. We find large stress fluctuations arising from sliding motions of the particles at the grain boundaries, which occur cooperatively to release the elastic energy stored. These dynamic processes are visualized with the aid of a sixfold angle ${\alpha }_j(t)$ representing the local crystal orientation and a disorder variable $D_j(t)$ representing a deviation from the hexagonal order for particle $j$.

3 pages, 3 figures

References in corpus (9)

• Amorphous Systems in Athermal, Quasistatic Shear
• Dynamics of Highly Supercooled Liquids:Heterogeneity, Rheology, and Diffusion
• Theory of nonlinear rheology and yielding of dense colloidal suspensions
• A study of the static yield stress in a binary Lennard-Jones glass
• Kinetic Heterogeneities in a Highly Supercooled Liquid
• A Molecular Hydrodynamic Theory of Supercooled Liquids and Colloidal Suspensions under Shear
• Transitions among crystal, glass, and liquid in a binary mixture with changing particle size ratio and temperature
• Critical Dynamics of Burst Instabilities in the Portevin-Le Chatelier Effect
• Scaling Behavior of the Portevin-Le Chatelier Effect in an Al-2.5%Mg Alloy

Cited by in corpus (5)

• Structural and dynamical heterogeneities in two-dimensional melting
• Plastic deformations in crystal, polycrystal, and glass in binary mixtures under shear: Collective yielding
• Scaling of relaxation and excess entropy in plastically deformed amorphous solids
• How does a thermal binary crystal break under shear?
• Incorporating a soft ordered phase into an amorphous configuration enhances its uniform plastic deformation under shear