Grain Boundary Shear Coupling is Not a Grain Boundary Property
arXiv:1810.04647 · doi:10.1016/j.actamat.2019.01.040
Abstract
Shear coupling implies that all grain boundary (GB) migration necessarily creates mechanical stresses/strains and is a key component to the evolution of all polycrystalline microstructures. We present MD simulation data and theoretical analyses that demonstrate the GB shear coupling is not an intrinsic GB property, but rather strongly depends on the type and magnitude of the driving force for migration and temperature. We resolve this apparent paradox by proposing a microscopic theory for GB migration that is based upon a statistical ensemble of line defects (disconnections) that are constrained to lie in the GB. Comparison with the MD results for several GBs provides quantitative validation of the theory as a function of stress, chemical potential jump and temperature.
References in corpus (1)
Cited by in corpus (11)
- On the Temperature Dependence of Grain Boundary Mobility
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- Disconnection-Mediated Migration of Interfaces in Microstructures: I. continuum model
- Grain-Boundary Topological Phase Transitions
- Multiphase field modeling of grain boundary migration mediated by emergent disconnections
- Why Grain Growth is Not Curvature Flow
- Effect of the atomic structure of complexions on the active disconnection mode during shear-coupled grain boundary motion
- Interface Faceting-Defaceting Mediated by Disconnections
- Grain boundary network plasticity: reduced-order modeling of deformation-driven microstructure evolution
- Intrinsic Grain Boundary Shear Coupling Tensor
- Grain boundary triple junction dynamics: a continuum disconnection model