采用末端淬火-硬度测试、差示扫描量热法、透射电镜、扫描电镜等方法,研究了固溶处理对Al-7.9Zn-2.5Mg-1.0Cu合金淬火敏感性的影响.结果表明:随着距淬火端面距离的增加,合金试样的硬度逐渐降低,处理制度为475℃/2 h试样的淬火敏感性明显比处理制度为450℃/8 h+475℃/2 h试样的低,其淬透层深度超过100 mm,而处理制度为450℃/8 h+475℃/2h试样的淬透层深度仅为65 mm.固溶处理制度对合金过饱和度的影响不大,但是与处理制度为475℃/2 h的试样相比,处理制度为450℃/8h+475℃/2 h试样的再结晶晶粒和(亚)晶界数目大大增加,促进了慢速淬火过程中η平衡相的析出,且尺寸相对粗化,导致了淬火敏感性的提高.
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