Influence of the heat treatment and extrusion process on the mechanical and microstructural properties of the AISi1MgMn Alloy

摘要

The paper describes the influence of homogenization temperatures (480 °C/5 h and 560 °C/6 h), methods of cooling rate after homogenization annealing and various extrusion processes (conventional extrusion K, press-quenching PQ, billet quenching BQ) upon the microstructural and mechanical properties of AISilMgMn (AA6082) alloy at industrial producing conditions. The mechanical properties of extruded rods from homogenized billets at 560 °C/6 h are higher after the extrusion processes PQ and BQ than the mechanical properties of the rods from homogenized billets at lower temperature. The rods, produced by process K, have higher tensile stress and yield stress in comparison to processes PQ and BQ. The reason is the distribution of Mg_2Si phase during the homogenization annealing and subsequent BQ and PQ treatment of the alloy.