Al-Mg-Si aluminum alloy with improved properties

摘要

An extrudable Al-Mg-Si aluminum alloy that is particularly useful near or near the front structure of a vehicle and has improved strength, corrosion resistance, crash properties and temperature stability. The composition of the alloy is defined within the range of the following coordinate points a1-a2-a3-a4 of the Mg-Si diagram, and by weight%, a1 = 0.60Mg, 0.65Si, a2 = 0.90Mg,. 0Si, a3 = 1.05Mg, 0.75Si, and a4 = 0.70Mg, 0.50Si, and the alloy has the following alloy components: Fe of 0.30 wt% or less, 0.1-0.4 Wt% Cu, 0.4 to 1.0 wt% Mn, 0.25 wt% or less Cr, 0.25 wt% or less Zr, and 0.005 to 0.15 wt% Ti (inevitable impurities) Each of which is not more than 0.1% by weight) and has an unrecrystallized grain structure in an extruded profile containing not more than 0.5% by weight of Zn and the balance Al.