Grain Boundary Triple Junction Dynamics: A Continuum Disconnection Model

@article{Wei2020GrainBT,
  title={Grain Boundary Triple Junction Dynamics: A Continuum Disconnection Model},
  author={Chaozhen Wei and Luchan Zhang and Jian Han and David J. Srolovitz and Yang Xiang},
  journal={SIAM J. Appl. Math.},
  year={2020},
  volume={80},
  pages={1101-1122}
}
The microstructure of polycrystalline materials consists of networks of grain boundaries (GBs) and triple junctions (TJs), along which three GBs meet. The evolution of such microstructures may be driven by surface tension (capillarity), applied stresses, or other means that lead to a jump in chemical potential across the GBs. Here, we develop a model for the concurrent evolution of the GB/TJ network based upon the microscopic mechanism of motion; the motion of line defects (disconnections) in… 
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References

SHOWING 1-10 OF 63 REFERENCES
A Continuum Multi-Disconnection-Mode model for grain boundary migration
We study the Grain Boundary (GB) migration based on the underlying disconnection structure and mechanism. Disconnections are line defects that lie solely within a GB and are characterized by both a
Disconnection description of triple-junction motion
TLDR
This work develops a theory of coupled GB/TJ migration and uses it to develop a physically based, disconnection mechanism-specific continuum model of microstructure evolution, and implements this model in a numerical, continuum simulation and demonstrates that it is capable of reproducing the molecular dynamics simulation results.
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 provides
In situ atomistic observation of disconnection-mediated grain boundary migration
TLDR
The atomistic mechanism of disconnection-mediated GB migration in different gold nanostructures is revealed using a state-of-art in situ shear testing technique combined with molecular dynamic simulations.
The Effect of Triple Junctions on Grain Boundary Motion and Grain Microstructure Evolution
The theory of steady state motion of grain boundary sytems with triple junctions and the main features of such systems are considered. A special technique of in-situ observations and recording of
Motion of Grain Boundaries with Dynamic Lattice Misorientations and with Triple Junctions Drag
TLDR
This work proposes a model for the evolution of the grain boundary network with dynamic boundary conditions at the triplejunctions, triple junctions drag, and with dynamic lattice misorientations, and derives system of geometric differential equations to describe motion of such grain boundaries.
Equation of Motion for a Grain Boundary.
TLDR
A continuum equation of motion for grain boundary derived from the underlying discrete disconnection mechanism is presented, which naturally exhibits junction drag-a widely observed phenomena in junction dynamics in solids and liquids.
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.
Triple junction drag effects during topological changes in the evolution of polycrystalline microstructures
Abstract Experiments, theory and atomistic simulations show that finite triple junction mobility results in non-equilibrium triple junction angles in evolving polycrystalline systems. These angles
Modelling the kinetics of a triple junction
Abstract The grain structure in a one phase system involves grain boundaries (surfaces), three-grain junctions (lines) and four-grain junctions (points). A certain Gibbs energy and mobility can be
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