Abstract: The aim of the work was to optimise the Hydrostatic Extrusion, HE, parameters in terms
of their influence on the microstructure and certain mechanical properties of 6082 aluminium alloy.
The investigations focused on the fabrication of a nano- or ultrafine-grained microstructure of the
alloy. The effects of a multi-pass process were compared with those of a one-pass process
producing the same cumulated true strain of 3.75. Both the multi-pass and the one-pass
deformation resulted in profound grain refinement of the alloy. The microstructure contained grains
with an average size of 195 nm and 239 nm, respectively. The grain refinement brought about a
significant improvement in the microhardness and tensile strength of the alloy. It should be noted
that the multi-pass HE produced slightly greater improvement than the single pass process.