采用Gleeble-1500热模拟试验机对含钪Al-Zn Mg合金进行热压缩实验,研究了合金在不同热压缩条件下的热变形行为和显微组织.结果表明:合金的流变应力随应变速率的增大而增大,随变形温度的升高而减小.该合金热压缩变形的流变应力行为可用Zener-Hollomon参数来描述,其热变形激活能为150.25kJ/mol.在变形温度为380℃,应变速率为1s=1条件下,合金组织中存在大量的位错墙,表明发生了动态回复现象.随着变形温度的升高,当温度为500℃时,合金中出现了再结晶晶粒,说明主要软化机制逐步由动态回复转变为动态再结晶.
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