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测试7A55铝合金在常规RRA和连续RRA处理过程中不同状态点的抗拉强度和电导率,并通过TEM观察7A55铝合金在常规RRA处理和连续RRA过程中的微观组织演变。结果表明,7A55铝合金无论采用常规RRA处理还是连续RRA处理,在高温回归过程中,晶内析出大量与基体不共格相(大量η′相和一些η相),同时晶界η相严重粗化并出现无沉淀析出带,电导率有大幅上升。另外,采用连续RRA处理工艺,1级时效后在适当的升温速度下,直接升温至回归温度进行回归处理,可以获得接近第1级时效的强度和38.1%IACS的电导率。
The tensile strength and electrical conductivity of 7A55 aluminum alloy at different state points during RRA and continuous RRA treatment were tested. The microstructure evolution of 7A55 aluminum alloy during conventional RRA and continuous RRA was observed by TEM. The results show that a large amount of non-coherent phases (a large number of η ’phase and some η phase) precipitated in the crystal during the high temperature regrind of 7A55 aluminum alloy, no matter using conventional RRA treatment or continuous RRA treatment, There was no sedimentation and precipitation, with a substantial increase in conductivity. In addition, the continuous RRA treatment process, the first grade aging at an appropriate heating rate, the temperature was raised directly to the regression temperature regressive treatment, you can get the first level of aging strength and 38.1% IACS conductivity.