主要采用金相、 X射线衍射和透射电镜等测试手段, 对Al10.8Zn2.9Mg1.9Cu合金在沉积、挤压和热处理3种状态的显微组织演变规律进行研究.结果表明: 合金在沉积和挤压前预热两种状态中基体都由等轴晶粒组成, 晶粒的平均尺寸分别约为23和24 μm, 热挤压之后, 晶粒平行挤压方向被拉长.在沉积和挤压两种状态中一次析出相主要为MgZn2, Al2Cu和Al2CuMg 3种, 没有发生变化;热处理之后, 一次析出相大部分回溶, 少量的Al2CuMg相没有回溶.Al10.8Zn2.9Mg1.9Cu合金经过热处理之后, 晶内分布大量弥散的尺寸约为6～15 nm的η′, 晶界上分布不连续、尺寸在10～20 nm左右的η相, 不存在明显的晶间无析出带.
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