3D Discrete Dislocation Dynamics Applied to Interactions between Dislocation Walls and Particles

• Authors: T. Záležák , A. Dlouhý
• Languages of publication: EN

Abstracts

EN

A 3D discrete dislocation dynamics model is presented that describes dislocation processes in crystals subjected to mechanical loadings at high temperatures. Smooth and curved dislocations are approximated by a set of short straight line segments. A Peach-Koehler force acting upon each segment involves all segment-to-segment interactions and externally applied stress. The segment velocity is a product of a corresponding mobility and the glide or climb component of the Peach-Koehler force. The model addresses interactions between dislocations and rigid spherical precipitates. A migration of low angle tilt boundaries situated in a field of precipitates is simulated as an example. The numerical implementation exploits symmetries of the model that yield an optimized and highly efficient numerical code. Results provide detailed insight into how dislocation arrangements surmount particle fields in 3D crystals.

Keywords

EN

61.72.Ff; 61.72.Hh; 61.72.Lk; 62.20.Hg

Discipline

• 62.20.Hg: Creep
• 61.72.Lk: Linear defects: dislocations, disclinations
• 61.72.Ff: Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
• 61.72.Hh: Indirect evidence of dislocations and other defects (resistivity, slip, creep, strains, internal friction, EPR, NMR, etc.)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2012
• Volume: 122
• Issue: 3
• Pages: 450-452

Dates

published

2012-09

Contributors

author

T. Záležák

• Institute of Physics of Materials, Academy of Sciences, Ži v zkova 22, 616 62 Brno, Czech Republic
• Department of Solid State Physics, Faculty of Sciences, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic

author

A. Dlouhý

• Institute of Physics of Materials, Academy of Sciences, Ži v zkova 22, 616 62 Brno, Czech Republic

References

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Identifiers

DOI

10.12693/APhysPolA.122.450