Reconciling grain growth and shear-coupled grain boundary migration.

ABSTRACT: Conventional models for grain growth are based on the assumption that grain boundary (GB) velocity is proportional to GB mean curvature. We demonstrate via a series of molecular dynamics (MD) simulations that such a model is inadequate and that many physical phenomena occur during grain boundary migration for which this simple model is silent. We present a series of MD simulations designed to unravel GB migration phenomena and set it in a GB migration context that accounts for competing migration mechanisms, elasticity, temperature, and grain boundary crystallography. The resultant formulation is quantitative and validated through a series of atomistic simulations. The implications of this model for microstructural evolution is described. We show that consideration of GB migration mechanis

SUBMITTER: Thomas SL 

PROVIDER: S-EPMC5700957 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature