Structure and Properties of Industrial Semifinished Products from a Weldable Corrosion-Resistant Aluminum Alloy of the Al–Mg–Si–Cu System

The results of comprehensive studies of a set of properties of experimental-industrial sheets and extruded profiles made of a new aluminum alloy V-1381 of the Al–Mg–Si–Cu system (6xxx series) are presented in the article. The alloy showed high manufacturability in industrial production during pressing (extrusion), as well as during hot and cold rolling. Using the Thermo-Calc software package, the mode of hardening of semifinished products was selected, and the modes of artificial aging were also investigated. It is shown that the V-1381T1 alloy is not inferior in mechanical properties to the foreign analog alloy AA6013, is characterized by a good combination of mechanical properties at room temperature (σu ≥ 380 MPa, σ0.2 ≥ 360 MPa, δ5 ≥ 13%) and elevated temperatures, and surpasses the widely used alloy D16chT in terms of yield strength by 20%, while having a lower density, better corrosion resistance, and the possibility of obtaining welded joints. The new V-1381 alloy can be recommended for use in aircraft fuselage structural elements, including in exchange for less corrosion-resistant nonweldable alloys of the D16 type, which will increase the weight efficiency of the structure both owing to increased strength and by replacement of riveted joints with welded ones.