Aluminium alloy 6082 combines a good toughness, excellent corrosion resistance with a very high strength. As a result it is widely used in structural applications in the building, marine and transport industries as well as for machined parts in the automotive industry. High strength of the 6082 alloy is achieved via: precipitation hardening, strain hardening and grain refinement which can be in economic way achieved by severe plastic deformation (SPD) methods, especially hydrostatic extrusion (HE) [1-4].

The aim of this work was to optimise the hydrostatic extrusion parameters in terms of their influence on the microstructure and mechanical properties of 6082 aluminium alloy. The investigations focused on the fabrication of nano- and ultrafine-grained form of 6082 aluminium alloy. In particular, multi-stage process was compared with single-stage process at the same cumulated true strain of 3.75.

Both multi- and single-stage extrusions resulted in profound grain refinement of 6082 aluminium alloy. The microstructure consisted of grains with 195 nm and 239 nm average size, respectively. The grain refinement induced significant improvement of mechanical properties. It should be noted that a slightly higher increase of the microhardness and tensile strength was observed for the multi-stage one.

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