High Plasticity of Massive Extruded Semi-Finished Products Made from High-Strength Aluminum Alloys
The results of scientific and technological work aimed at developing a technology for producing extruded massive shapes from Al-Zn-Mg-Cu high-strength alloy having the strength of about 700 MPa and elongation in the vertical direction of more than 3 % are presented. In order to achieve this goal, the structure of the profiles was changed as follows: the volume fraction of excess phases was reduced from 4 to 0.2 %, the type of the grain structure was changed from the completely recrystallized structure to the highly polygonized one, corresponding to the beginning of recrystallization, and the intensity of the crystallo-graphic texture was reduced. As a result, the shapes were obtained with a high plasticity of 6-8 % and their strength in the longitudinal direction was kept on the level of 700 MPa.