| 摘要 |
<p>Provided is an aluminum alloy with which not only is improved productivity in terms of extrudability and forging performance realized, but also the necessary properties are satisfied, by optimization of the amount of elements contained in the aluminum alloy. Provided is an aluminum alloy, characterized by comprising 5.5 to 7.0% of Si, 1.0 to 2.0% of Cu, 0.4 to 0.8% of Mg, 0.05 to 0.15% of Cr, 0.05 to 0.25% of Ni, and further, 0.01 to 0.05% of Sr as desired, with the balance being Al and inevitable impurities, wherein when the eutectic Si size at the center in the cross section perpendicular to the lengthwise direction of the extruded material is Sc and the eutectic Si size of the surface layer side is Ss, Sc - Ss <u><</u> 15 µm2 and the number of particles having a eutectic Si size of 20 µm2 or less is 1,000 to 3,000 particles/mm2.</p> |
