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The flow stress of a commercial 5182 aluminum alloy has been investigated as a function of strain rates in the range from 1x10-3 to 4x103s-1 at room temperature. The 5182 alloy exhibited the negative strain rate sensitivity of flow stress in a strain rate range below 102 s-1, of which the maximum flow stress decreased with increasing strain rate. This tend in flow stress with strain rates was observed for other commercial aluminium alloys which include magnesium atoms in solute such as the 3004 and 7N01 alloys. It seems that the microstructual evolution during deformation has occurred in these alloys. The incremental strain rate tests revealed that the true strain rate sensitivity is positive under the same structure of alloys, and there appear to be the negative strain rate sensitivity corresponding to the microstructural evolution after some deformations. From the observation by transmission electron microscopy, the decreasing of dislocation densities resulting from the arrangement of the network-like deformation bands by dislocations with straining, lead to the lower stresses at the strains where the negative strain rate sensitivity is observed

THE MICROSTRUCTURAL EVOLUTION DURING DEFORMATION UNDER SEVERAL STRAIN RATES IN A COMMERCIAL 5182 ALUMINIUM ALLOY