Find in Library

Stress-strain curves of the EN AW 6082 aluminium alloy with 1.2 Si-0.51 Mg-0.75 Mn (wt.%) were determined by the uniaxial compression tests at temperatures of 450&#8722;550 &#176;C with a strain rate of 0.5&#8722;10 s^&#8722;1. The initial structure state corresponded to three processing types: as-cast structure non-homogenized or homogenized at 500 &#176;C, and the structure after homogenization and hot extrusion. Significantly higher flow stress appeared as a result of low temperature forming of the non-homogenized material. Hot deformation activation energy <i>Q</i>-values varied between 99 and 122 kJ&#183;mol^&#8722;1 for both homogenized materials and from 200 to 216 kJ&#183;mol^&#8722;1 for the as-cast state, while the <i>Q</i>-values calculated from the measured steady-state stress were always higher than those calculated from the peak stress values. For the extruded state of the 6082 alloy, the physically-based model was developed to reliably predict the flow stress influenced by dynamic softening, temperature, strain rate, and true strain up to 0.6.