Relationship between Equilibrium Fluctuations and Shear-Coupled Motion of Grain Boundaries

Alain Karma, Zachary T. Trautt, and Yuri Mishin

Phys. Rev. Lett. 109, 095501 – Published 27 August 2012

Abstract

We derive general analytical expressions relating the equilibrium fluctuations of a grain boundary to key parameters governing its motion coupled to shear deformation. We validate these expressions by molecular dynamics simulations for symmetrical tilt boundaries and demonstrate how they can be used to extract the misorientation dependence of the grain-boundary mobility. The results shed light on fundamental relationships between equilibrium and nonequilibrium grain-boundary properties and provide new means to predict those properties.

Received 20 June 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.095501

Authors & Affiliations

Alain Karma¹, Zachary T. Trautt², and Yuri Mishin²

¹Physics Department and Center for Interdisciplinary Research on Complex Systems, Northeastern University, Boston, Massachusetts 02115, USA
²Department of Physics and Astronomy, MSN 3F3, George Mason University, Fairfax, Virginia 22030, USA