Advanced Aluminum Alloys Used in the Manufacture of Products in Extrusion Process

摘要

The subject of the research was an alloy AlCuMgMn with the addition of zirconium (Zr) and scandium (Sc) manufactured for extrusion processes like bars, profiles or tubes. This paper presents results of the research on structure evolution and mechanical properties for different tempers of precipitation strengthening. The article also presents results of the investigations of an AlCuMgMn (ZrSc) alloy produced in powder form. The powder of this alloy was subjected to consolidation in the process of direct hot extrusion. The aim of the study was to optimize the process of aluminum (Al) alloy powder hot extrusion using conical dies. Parameters of the powder consolidation process were determined in terms of the choice of the tool (die) geometry, extrusion ratio, and temperature, allowing for an influence of these parameters on alloy density and mechanical properties after direct hot extrusion. Obtained results R_m above 500MPa (for AlCuMg alloy) show significant possibilities of manufacturing from Al alloy powder products with ultrafine grain structures, which properties exceed those of alloys manufactured using standard methods.