The grain boundary mobility tensor

@article{Chen2020TheGB,
  title={The grain boundary mobility tensor},
  author={Kongtao Chen and Jian Han and Xiaoqing Pan and David J. Srolovitz},
  journal={Proceedings of the National Academy of Sciences},
  year={2020},
  volume={117},
  pages={4533 - 4538}
}
Significance Defects and microstructures have a profound impact on material strength and ductility. Microstructure engineering can enhance/trade-off between these properties. One of the key parameters that dictates microstructure evolution is grain-boundary mobility. We demonstrate the fundamental nature of the mobility, reconciling a wide range of observations in a consistent model. We argue that the mobility is, in general, a tensor (classically, it is a scalar) and determine all of its… Expand
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References

SHOWING 1-10 OF 73 REFERENCES
Reconciling grain growth and shear-coupled grain boundary migration
TLDR
The authors present a model that connects grain growth directly to the disconnection mechanism of grain boundary migration and can account for the many deviations observed experimentally. Expand
Grain boundary shear coupling is not a grain boundary property
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.Expand
Survey of computed grain boundary properties in face-centered cubic metals: I. Grain boundary energy
Abstract The absolute grain boundary mobility of 388 nickel grain boundaries was calculated using a synthetic driving force molecular dynamics method; complete results appear in the SupplementaryExpand
Grain-Boundary Kinetics: A Unified Approach
Grain boundaries (GBs) are central defects for describing polycrystalline materials, and playing major role in a wide-range of physical properties of polycrystals. Control over GB kinetics providesExpand
The role of crystallography and the mechanisms associated with migration of incoherent twin grain boundaries
Abstract With twin grain boundaries playing an important role in numerous materials, it is important to understand their behavior across the full range of possible boundary plane orientations. ThisExpand
Experimental Observations of Stress-Driven Grain Boundary Migration
TLDR
An experimental investigation of stress-driven grain boundary migration manifested as grain growth in nanocrystalline aluminum thin films indicates that shear stresses drive grain boundaries to move in a manner consistent with recent molecular dynamics simulations and theoretical predictions of coupled grain boundaries migration. Expand
Stress-enhanced grain growth in a nanocrystalline material by molecular-dynamics simulation
Molecular-dynamics simulations are used to elucidate the coupling between grain growth and grain-boundary diffusion creep in a polycrystal consisting of 25 grains with an average grain size of aboutExpand
INFLUENCE OF SOLUTES ON THE MOBILITY OF TILT BOUNDARIES
Grain boundaries have a profound effect on the strength of metals and alloys. Material properties,can be changed significantly by boundary migration. Studies of grain boundary mobility in matrices ofExpand
Mechanical behavior of Σ tilt grain boundaries in nanoscale Cu and Al: A quasicontinuum study
Molecular simulations using the quasicontinuum method are performed to understand the mechanical response at the nanoscale of grain boundaries (GBs) under simple shear. The energetics and mechanicalExpand
Evidence of grain boundary dislocation step motion associated to shear-coupled grain boundary migration
Abstract The present work reports dynamical observations of the grain boundary (GB)-mediated plasticity during in situ transmission electron microscopy straining experiments at moderate temperatureExpand
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