Comments on Dislocation Velocity and Macro-Deformation in Molybdenum

Abstract

This note presents several comments on the paper "Dislocation Velocity Measurements in High Purity Molybdenum" by Prekel, Lawley, and Conrad (PLC). PLC concluded from their result "that plastic deformation of molybdenum is controlled by the thermally assisted overcoming of the Peierls-Nabarro hills by the double kink mechanism proposed by Seeger, at least in the stress ranges that were examined". Further PLC suggest that "the same mechanism is operative during micro- and macro straining", and "the equivalence of experimental data from strain rate change experiments and dislocation velocity measurements also substantiates the usual assumption that the mobile dislocation density and long range internal stress field remain constant during a strain rate change."

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