aluminum alloy extruded material with excellent bending crushability and corrosion resistance

摘要

Disclosed is an Al—Mg—Si aluminum alloy extrudate which contains, in terms of mass %, 0.60-1.20% Mg, 0.30-0.95% Si, 0.01-0.40% Fe, 0.30-0.52% Mn, 0.001-0.65% Cu, and 0.001-0.10% Ti and in which the contents of Mg and Si satisfy Mg(%)−(1.73×Si(%)−0.25)≧0 and the remainder comprises Al. The extrudate has an equi-axed recrystallized grain texture in which the areal proportion of recrystallized grains is 65% or higher. In examination with a TEM having a magnification of 5,000, intergranular precipitate grains having a size of 1 μm or more in terms of center-of-gravity diameter are apart from one another at an average spacing exceeding 25 μm. The average areal proportion of Goss-orientation grains is less than 8% throughout the whole thickness of this extrudate.