采用硬度检测、透射电镜观察、选区电子衍射等方法,研究了Al-Cu合金固溶态、含θ'相和含θ相的试样在强变形诱导析出相低温回溶后的加热退火过程中晶粒尺寸、高角晶界百分比及组织结构和硬度的变化.试验结果显示:当退火温度低于150℃时,A1-Cu合金三种状态的试样其晶粒尺寸与高角晶界的百分数基本上没有变化;加热温度至200℃以上后,晶粒尺寸、高角晶界百分比开始增加;加热至250 ℃时,固溶态试样的晶粒尺寸长大至100 μm左右,含析出相的试样品粒尺寸保持在10.0～15.0μm.在250 ℃退火50 min后,固溶态试样的硬度值一直低于含θ'、θ析出相试样的硬度值.
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