建立了塑性流动本构模型,对Al3003-H12、2219-T87、7050-T7451、2024-T351和LY12-cz 5种典型的铝合金在应变率从10-4 /s到8 000 /s,初始温度从77 K到800 K以及真实应变超过0.50条件下进行系统实验,并对塑性流动行为进行分析.结果表明:这些铝合金材料具有应变率效应;铝合金材料应变率敏感性可归于短程障碍对热激活位错运动的影响;在200～600 K时,这些材料存在第三类动态应变时效现象.基于热激活位错运动机制,推出一个物理概念的本构模型,比较得出的模型预测结果和实验结果一致,可方便用于工程应用.
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