Al-Mg-Si aluminum alloy extruded material which is excellent in impact energy absorbing

摘要

PROBLEM TO BE SOLVED: To obtain an Al-Mg-Si alloy extruded article excellent in impact- energy absorbability against a compressive impact in the extruded direction and suitable as a structural member of an automobile or train. SOLUTION: This Al-Mg-Si alloy extruded shape material has proof stress of =150 N/mm2, and, in an instrumentation Charpy test, the absorbed energy on and after the maximum load point to the absorbed energy till the maximum load point is =60%. The aluminum alloy has a composition containing 0.3 to 1.1% Mg, 0.5 to 1.3% Si, 0.05 to 0.7% Cu and 0.005 to 0.2% Ti and further containing one or more kinds selected from 0.05 to 0.2% Zr, 0.05 to 0.5% Mn and 0.001 to 0.2% Cr, and the balance Al with inevitable impurities.