MODEL Simulations
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Computer simulations with
MODEL illustrate many features of dislocation microstructure
evolution. The following are examples of various applications of
MODEL.
Indentation
Mechanisms
- JG. The Johnston-Gilman mechanism of dislocation dipole formation. Dislocations with existing jogs are likely to generate rafts of dipoles when the two arms connected to the jogs move significantly faster than the jog. Loops are created by cross slip of parallel screw components. Note how dipoles can be dragged by other dislocations.
Micropillars
- Cyinder Compression 1 μm. Compression of a 1000 nm Nickel cylinder under a constant prescribed displacement.
Large networks of dislocations, with a density around 1012 m-2, interact together to form junctions.
- Cylinder Compression 250 nm 1. Compression of a 250 nm Nickel cylinder under a constant prescribed displacement.
Dipolar-loops interact to form junction and single- and double arm sources
- Cylinder Compression 250 nm 2. Compression of a 250nm Nickel cylinder under a constant prescribed displacement.
Dipolar-loops interact to form junction and single- and double arm sources. The pillar passes through stages of near-starvation with mostly small debris left in the crystal.
- Cylinder Compression 750nm. Compression of a 750 nm Nickel cylinder under a constant prescribed displacement.
Dipolar-loops interact to form junction and single- and double arm sources.
- Crystal Deformation. The evolution of the dislocation network is coupled with the boundary value problem of the deforming crystal. The coupling allows to account for image forces on dislocations for arbitrary boundary conditions imposed on the embedding crystal.