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采用透射电镜、X射线衍射、硬度测试等实验方法,研究了不同时效处理工艺对铸轧7050铝合金组织和性能的影响。结果表明:随着单级时效温度的升高,合金达到峰值硬度所需的时间缩短,合金的峰值硬度降低,晶内和晶界析出相也随温度的提高发生不同程度的长大;双级时效时,晶内有较多粗大的析出相,晶界析出相已不再连续且已经发生长大,晶界无沉淀带更加明显;回归再时效处理时,晶内析出相与单级时效时相比发生粗化,晶界上为断续的粗大长条状析出物,无偏析带加宽。
The effects of different aging treatments on the microstructure and properties of 7050 aluminum alloy cast by casting have been studied by using transmission electron microscopy, X-ray diffraction and hardness testing. The results show that with the increase of the single-stage aging temperature, the time required for the alloy to reach the peak hardness is shortened, the peak hardness of the alloy decreases, and the precipitates in the grain boundaries and grain boundaries also grow to varying degrees as the temperature increases. When aging, there are more coarse precipitates in the grain, the precipitates of the grain boundaries are no longer continuous and have grown up, and no precipitates are more obvious in the grain boundaries. When the re-aging treatment is carried out, the intragranular precipitates and single-stage aging Coarsening compared to coarse grain boundaries, intermittent coarse long strip of precipitate, no segregation zone widening.