A Tribute to F.R.N. Nabarro by John P. Hirth

By John P. Hirth

New types for dislocation constitution and movement are provided for nanocrystals, nucleation at grain limitations, stunned crystals, interphase interfaces, quasicrystals, advanced constructions with non-planar dislocation cores, and colloidal crystals. A assessment of experimentally verified major positive factors of the magnetoplastic influence with their actual interpretation explains many various result of this sort. The version has many capability purposes for forming methods motivated via magnetic fields.

• Dislocation version for the magnetoplastic effect
• New mechanism for dislocation nucleation and movement in nanocrystals
• New types for the dislocation constitution of interfaces among crystals with differing crystallographic structure
• A unified view of dislocations in quasicrystals, with a brand new version for dislocation motion
• A common version of dislocation habit in crystals with non-planar dislocation cores
• Dislocation houses at excessive velocities
• Dislocations in colloidal crystals

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Atomistic simulation has revealed that atomic scale GB processes such as atomic shuffling and free volume migration occur before and/or after partial dislocation nucleation and facilitating local stress relaxation [96,105]. Whether the observed stress relief is transferable to experimental conditions or whether this is related uniquely to the purity of the GBs remains an open question. The fact is that upon dislocation nucleation at a particular GB, the associated stress relief within that boundary makes it unlikely that the nucleation of the trailing partial dislocation will be seen within the timeframe of a simulation unless the ratio between an empirical potential’s unstable to stable stacking fault is very close to unity.

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