Calculation of the Peierls barrier with a tension-Frenkel-Kontorova model

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Abstract
A tension—Frenkel-Kontorova dislocation model with a nonlinear interatomic force appears to be better justified than previous models in the interpretation of the Peierls stress of dislocation motion. Numerical anisotropic calculations on several fcc crystals result in good agreement within the order of Seeger's double-kink-generation interpretation of Bordoni relaxation peaks. Comparisons of the recalculation results of the Peierls stress with Hobart's compression model suggest that the present tension model is a more realistic representation of an edge-dislocation migration, in which energy is thought to be concentrated on these tension atoms just below the slip plane. It is also possible with this analysis to estimate the surface energies of material studied by internal friction in close agreement. This suggests that the tension—Frenkel-Kontorova model is more than a phenomenological representation of an edge dislocation.

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