采用透射电镜观察、能谱分析等手段,研究了经多级断续时效处理后的高纯Al-4.5Cu-0.4Mg-0.4Ag合金在不同热暴露条件下的微观组织演变.结果表明:在不施加应力条件下,晶内主要强化相Ω能够在150℃长期稳定存在,但θ'相有所长大且析出数量明显增加;提高热暴露温度至200℃,Ω相和θ'相均发生明显长大,部分Ω相向平衡相θ转变,同时晶内析出一定数量的新相σ相;在较高热暴露温度200℃施加恒应力200MPa时,将促进θ'相和尺寸较小的Ω相向晶内回溶,并加速尺寸较大Ω相的粗化.此外,平衡相S相在晶内优先析出.
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