| 摘要 |
PROBLEM TO BE SOLVED: To provide an aluminum alloy extrusion material whose hardening directly after extrusion is facilitated, and having high strength and excellent impact crack resistance.SOLUTION: Provided is an aluminum alloy extrusion material having a composition comprising, by mass, 0.60 to 1.50% Mg, 4.0 to 7.0% Zn, 0.10 to 0.50% Cu, 0.10 to 0.50% Cr, 0.15 to 0.25% Zr, 0.1% or lower of Ti, and the balance aluminum with inevitable impurities, and is obtained by performing quenching treatment by air cooling at a cooling rate of 100°C/min or less directly after extrusion and thereafter performing aging treatment. |
