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采用 Ｇｌｅｅｂｌｅ １５００热压缩模拟试验机研究了 Ａｌ－Ｚｎ－Ｍｇ（７００５）合金的高温变形组织演化行为．利用 ＴＥＭ分析了合金在不同压缩条件下的组织形貌特征，采用ＥＢＳＰ分析了晶粒间的取向差，研究了其动态再结晶行为通过回归分析建立了７００５合金热变形条件与变形亚晶尺寸间关系的半经验模型．合金平均亚晶大小随温度补偿应变速率 Ｚ参数（Ｚｅｎｅｒ－Ｈｏｌｌｏｍｏｎ参数）的降低而增大，其倒数与Ｚ参数的自然对数和流变应力双曲正弦项的自然对数间均满足线性关系．合金在ｌｎ Ｚ＜２１．０条件下变形时，发生几何动态再结晶并形成了细小的等轴再结晶晶粒．
The deformation behavior of Al-Zn-Mg (7005) alloy during high temperature deformation was investigated by Gleeble 1500 hot compression simulation test machine. The morphologies of the alloy under different compression conditions were analyzed by TEM. The difference in orientation between the grains was analyzed by EBSP. The dynamic recrystallization behavior of the 7005 alloy was studied by regression analysis. The thermal deformation conditions and the deformation subgrain size Semi-empirical model of relationship. The average subgrain size increases with the decrease of the temperature-compensated strain rate Z parameter (Zener-Hollomon parameter). The reciprocal of the alloy satisfies the linear relationship between the natural logarithm of the Z parameter and the natural logarithm of the hyperbolic sine of the flow stress . When the alloy is deformed under the condition of ln Z <21.0, geometric dynamic recrystallization occurs and fine equiaxed recrystallized grains are formed.