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
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