The flow stress of aluminum alloy 6082M under cyclic, non-monotonic plastic deformation has been determined by multiaxial forging experiments, using the MaxStrain system on a Gleeble 3800 thermo-physical simulator. The simulations were done at ambient temperature with different strain rates of 0.1, 1.0 and 10 1/s. The plastic strain amplitude per forging pass was 0.4. The accumulated equivalent strain was around 4 in each forging simulation.For the mechanical modeling of the cyclic, non-monotonic plastic deformation characteristic of the forming process, a control program and measurement arrangements have been developed. These controlled the equivalent logarithmic strain and the equivalent strain rate implemented in each forming step. It was also suitable for measuring the dimensions of the deformed material volume between the tools. These parameters and the measured force data were applied in the mechanical model, based on the principle of virtual velocities.In parallel with the cyclic experiments, monotonic plane-strain Watts-Ford compression tests were also performed. Strain rate influence for material properties has been investigated. Monotonous and cyclic flow curves were compared, and significant differences were found. Contrary to the monotonous flow curve, the cyclic flow stress showed the Bauschinger effect, occurring when the load direction was changed. Concerning the effect of strain rate it can be concluded that the applied strain rate influences the strain hardening, the resultant hardness and the characteristic properties of the generated ultrafine-grained microstructure.