(上海大学 材料科学与工程学院，上海 200072)
摘 要: 采用透射电镜及三维原子探针研究元素Cu对6082Al-Mg-Si合金170 ℃时效初期GP区的影响。研究结果表明：添加元素Cu的Al-Mg-Si合金经170 ℃时效30 min后在合金中形成了大量由Mg、Si和Cu 3种元素组成的GP区，元素Cu的存在促进了合金时效初期GP区的形成，但并没有改变GP区中Mg和Si的摩尔比，Cu原子存在的GP区中Mg和Si的摩尔比仍然接近1。添加元素Cu的合金经170 ℃时效30 min后，合金中还出现短针状的预β″相。
关键字: Cu；Al-Mg-Si合金；GP区；三维原子探针；析出相
6082 Al-Mg-Si alloy aged
（School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China）
Abstract:The effect of Cu addition on the GP zones of 6082Al-Mg-Si alloy during the early stage of ageing at 170℃ was investigated by transmission electron microscope(TEM) and three-dimensional atom probe (3DAP). The results show a great deal of GP zones including Mg, Si and Cu atoms form in the alloy with 0.6%Cu, which is aged at 170 ℃ for 30 min. The addition of Cu accelerates the forming of GP zones, but it does not change the mole ratio of Mg and Si in GP zone and the mole ratio of the GP zones is still close to 1. The shot needle-shaped pre-β″ precipitation appears in the alloy after Cu is aged at 170 ℃ for 30 min.
Key words: Cu; Al-Mg-Si alloy; GP zone; three-dimensional atom probe; precipitation phase
