Kink mobility and flow stress behaviour of L12, alloys

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Abstract
Implications are investigated of a deformation mechanism founded on the idea that kinks on screw dislocations are capable of transporting Kear—Wilsdorf configurations. In this mechanism, which takes into account microstructural features observed experimentally, Kear—Wilsdorf configurations need not transform into a glissile core prior to movement, as envisaged in previous treatments. The total friction stress that should be overcome in order to activate kink slip depends upon kink distribution; this stress is shown to increase as the bending of Kear—Wilsdorf configurations in the cube plane increases. The consistency between the present kink dragging mechanism and selected mechanical properties of L12, alloys is discussed.