Abstract
The activation energy ΔH ∗ for forming a rectangular kink pair in a dislocation on a Peierls potential is calculated. If the potential is smooth and has only one minimum, the energy ΔH ∗(τ) decreases monotonously with the applied stress τ. If the potential has the shape of a camel-hump, with an intermediate minimum, discontinuities appear in ΔH ∗(τ) . When the top of the potential is nearly flat or has a shallow minimum, the ΔH ∗(τ) curve has a hump, causing a hump in the temperature dependence of the critical shear stress.
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