通过常规拉伸、慢应变速率拉伸和晶间腐蚀实验研究了T6及双级时效处理对6156铝合金力学性能与腐蚀性能的影响,并采用透射电镜(TEM)观察了析出相特征.结果表明:6156合金在T6欠时效状态下晶内析出相主要为GP区,晶界无明显析出相；T6峰时效晶内析出相主要为β"相,出现少量的Q＇相,晶界析出物呈连续分布,合金虽然具有最高强度,但晶间腐蚀严重,应力腐蚀敏感性最大；随时效时间延长,Q＇相增多并逐渐粗化,晶界析出物粗大非连续分布；T78时效态晶内析出大量的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,无沉淀析出带(PFZ)变宽,因此相比T6态而言T78状态合金强度损失不大而耐蚀性得到明显提高.
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