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中文摘要：
采用末端淬火一硬度测试、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．OCu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℃／2h试样的淬火敏感性明显比处理制度为450℃／8h＋475℃／2h试样的低，其淬透层深度超过100mm，而处理制度为450℃／8h＋475℃／2h试样的淬透层深度仅为65mm。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℃／2h的试样相比，处理制度为450℃／8h＋475℃／2h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叶平衡相的析出，且尺寸相对粗化，导致了淬火敏感性的提高。
英文摘要：
The influence of solution treatment on the quench sensitivity of AI-7.9Zn-2.5Mg-1.0Cu alloy during quenching was investigated by optical microscopy（OM）, differential scanning calorimetry （DSC）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM） and end quenching- hardness measurement. The results show that the hardness of different solution treatment samples decreases with the distance from quenching end increase. Moreover, the quench sensitivity of 450 ℃/8 h＋475 ℃/2 h treatment sample is higher than that of samples of 475 ℃/2 h treatment. The quenched depth is about 65mm, while that of samples of 475 ℃/2 h treatment is more than 100mm. There is few effects of solution treatment on the degree of supersaturation, While comparing to 475 ℃/2 h singlesolution sample, the number of recrystallization grains and subgrains of 450 ~CI8 h＋475 ℃/2 h doublesolution sample increase, which facilitated separation of more coarse r/ equilibrium particles in the samples of, and lead to higher quench sensitivity.
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