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中文摘要：
通过末端淬火试验研究了亚晶界对Al-7．01Zn-1．26Mg-1．43Cu合金淬火过程中的淬透性和第二相析出行为的影响。两组试样分别在440℃和480℃温度下固溶处理，以获得不同的再结晶分数。结果表明，亚晶界能够增大合金最大硬度值，但会明显降低淬透层深度。由于亚晶界的增加而引起的表面能的变化降低了相变激活能，故能够促进η’相的形成及向η相的转变。
英文摘要：
The effects of sub-grain boundaries on the quenching sensitivity and the precipitation behavior in Al-7.01Zn-1.26Mg- 1.43Cu alloy were investigated by an end-quenching test. Specimens were solution treated at 440 ℃ and 480 ℃ to get different recrystallization fractions, respectively. The results show that the maximum hardness value of the Al-Zn-Mg-Cu alloy can be improved by the sub-grain boundaries, but the depth of age-hardening layer decreases significantly. The precipitation temperature and the activation energy are reduced by the changes of surface energy, which is induced by sub-grain boundaries. So, the precipitation process from η phase to η phase becomes much easier. In this way, an increase in the number of sub-grain boundaries promotes the precipitation of MgZn2 particles, especially η＇-MgZn2.
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