Abstract
A new model describing the dislocation density evolution in alloys with hexagonal structure is proposed. Forest dislocations and non-dislocation obstacles are considered as obstacles for primary dislocations. Annihilation of dislocations due to recovery processes is assumed. The stress dependence of the work hardening rate is derived. Experimental results obtained for magnesium alloy AM20 (Mg-2wt.%Al-0.1wt.%Mn) deformed at various temperatures are analysed. The proposed model describes satisfactorily the shape of the stress dependence of the work hardening rate.

Key words
Mg alloy, work hardening behaviour, dislocation density evolution

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