Abstract
The Lukac-Balik model, describing the dislocation density evolution in metallic alloys, was applied for characterization of work hardening behaviour of room temperature deformed magnesium alloys, containing various amounts of aluminium and zinc. The analysis of stress dependences of the work hardening rate predicted by the model has shown that the solute elements strongly influence hardening and softening processes. The Zn addition enhances annihilation of dislocations by cross slip and thereby the ductility at room temperature. On the other hand, Al increases the room temperature strength because of blockage of dislocations moving in basal slip system.

Key words
magnesium alloys, plastic deformation, hardening behaviour, dislocation density evolution

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