在Gleeble-1500热模拟试验机上对Al-6.1Zn-2.8Mg-1.9Cu-0.25Cr铝合金进行高温等温压缩实验,研究该合金在变形温度为300 ~ 500℃、应变速率为0.01~1 s-1条件下的流变行为,建立合金高温变形的本构方程,采用TEM分析变形过程中合金的组织特征.结果表明:合金变形抗力随变形温度的升高而下降,随应变速率升高而增大.在360 ~400℃范围内变形时,合金组织仅发生动态回复,当变形温度高于400℃以后,合金热变形以动态再结晶为主.应变速率在0.01~1 s-1范围内,不影响合金的变形软化机制,但对合金亚结构的影响较大,随应变速率的增加,位错密度增加,亚晶尺寸减少.此合金适宜的变形条件为变形温度380 ~400℃、应变速率0.1 s-1.
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