| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al-Mg-Si alloy extruded shape material for a side member free from the generation of cracking in the case of being applied with compressive deformation at the time of a collision, high in energy absorbing efficiency and excellent in collapse characteristics. SOLUTION: This Al-Mg-Si alloy extruded shape material for a side member excellent in collapse characteristics is the one in which, in an extruded shape material having a compsn. contg., by weight, 0.6 to 1% Si, 0.5 to 0.9% M9, 0.4 to 0.8% Cu (where 0.4% is not included), 0.1 to 0.4% Fe, 0.2 to 0.6% Mn, 0.05 to 0.3% Cr and/or 0.05 to 0.25% Zr, 0.001 to 0.1% Ti, 0.0001 to 0.004% B, the balance Al with inevitable impurities, and the inside structure of the extruded shape material is mainly composed of the fibrous one.
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