Abstract
Abstract Screw dislocation motion in dilute b.c.c. transition metal alloys has been investigated using a tight-binding type electronic theory coupled to the moments approach. The repulsive cort—core interaction energies are simulated by a Born—Mayer potential. Assuming existence of solute enriched clusters (SEC), the Peierls stress of the dilute alloys is calculated and compared with the available experimental data, in relation to the alloy softening. It is found that the Peierls stress of the SEC could be reduced significantly compared with that of the solvent (α-Fe) metal, provided that diagonal disorder due to alloy (SEC) formation is sufficiently large.
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