Effect of Stressed State Type on Work Hardening and Evolution of Dislocation Structure in Magnesium Single Crystals

The type of stressed state (compression, simple shear) is shown to effect the parameters of a work hardening curve for Mg single crystals under basic slip. The electron-microscopic results for the dislocation structure are indicative of the fact that work hardening at stage A of the work hardening curve is connected with the basis-basis dislocation interaction, while the to-B-stage transition and a rapid growth of strain stress are due to the interaction between basic dislocations and “forest” dislocations in the {101 0} {112 0} systems, the latter dislocations arising from the stress relaxation in the primary slip system.