采用Gleeble-3500热模拟试验机对铸态7A85铝合金进行高温热压缩实验,研究了7A85铝合金在变形温度为300～450℃、应变速率为0.01～10s-1条件下的流变行为与显微组织.结果表明:流变应力在变形初期迅速升至峰值,随后由于动态回复和动态再结晶有所降低,最后趋于稳态;峰值流变应力随变形温度的降低和应变速率的增加而增大,可用Zener-Hollomon参数描述.采用线性回归方法获得7A85铝合金高温条件下流变应力本构方程,其变形激活能Q为253.68kJ/mol.随着lnZ降低,晶粒沿径向拉长,亚晶长大,位错密度和第二相数量降低.软化机制主要为动态再结晶.
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