| 摘要 |
The invention relates to an autobody skin piece, which has a thickness ranging from 0.8 to 1.2 mm, and which is made of an alloy comprised of (% by weight): 0.7 1.3 of Si; <0.5 of Fe; 0.5 1.1 of Cu; 0.4 1.0 of Mn; 0.6 1.2 of Mg; <0.7 of Zn; <0.25 of Cr; <0.20 of Zr + Ti; other elements, each of which being <0.05 and totaling <0.15, and; the remainder consists of aluminum. The skin piece has, after solution treatment, tempering and age-hardening for 3 weeks at ambient temperature, an elastic limit R0.2 less than 170 MPa, preferably, 160 MPa. The inventive piece exhibits, when fixed in a pre-painted state to a steel structure, an improved behavior with regard to differential expansion with the steel.
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