设计了一种成分为Al-0.42Mg-0.50Si-0.99Cu的新型工业型材用铝合金,通过光学显微镜、透射电镜及万能拉伸试验机等研究了不同时效制度对其组织、力学性能以及晶间腐蚀性能的影响.结果表明:合金在T6欠时效时晶界无明显析出相；T6峰时效时晶界析出物细小连续分布,晶间腐蚀严重；随时效时间延长,Q '相增多并逐渐粗化,晶界析出物粗大呈非连续分布；双级时效时晶内析出了大量Q '相,晶界析出相球化且析出相之间的间距增大,呈断续分布,无析出带(PFZ)变宽,抗腐蚀能力增强；合金在T6峰时效时强度最高,但晶间腐蚀敏感性大；双级时效可在强度损失不大的情况下明显提高其耐蚀性.
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