| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al-Zn-Mg-based aluminum alloy which is an extruded product having high strength, excellent toughness and satisfactory extrusion productivity, and which is particularly effective in the improvement of axial crushing properties.SOLUTION: The aluminum alloy extruded product that exhibits excellent impact cracking resistance is formed of an aluminum alloy that includes, by mass, 0.50 to 0.75% Mg, 4.5 to 6.5% Zn, 0.10 to 0.20% Cu, 0.17 to 0.23% Zr, 0.005 to 0.05% Ti, 0.05% or less Mn, 0.03% or less Cr, 0.20% or less Fe, 0.10% or less Si, and the balance Al with unavoidable impurities. |
