采用Gleeble-1500热模拟试验机对3003铝合金进行变形温度为400℃,应变速率为0.01～10.0 s-1的等温压缩实验,获得热变形过程中的真应力-真应变曲线。结果表明:应变速率ε≥1.0 s-1时,实际变形温度高于预设温度,产生变形热效应。合金发生动态再结晶的临界应变随着应变速率的升高而增加,在较高应变速率条件下(ε≥1.0 s-1),流变应力曲线出现锯齿形波动,合金发生了不连续动态再结晶。利用光学显微镜和透射电镜分析了应变速率对3003铝合金热变形组织演变的影响。结果表明:应变速率越小,合金越容易发生动态再结晶,当应变速率为10.0 s-1时,由于变形热效应的作用,合金也发生了动态再结晶。低应变速率(ε≤0.1 s-1)条件下,提高应变速率可以明显细化晶粒,并且在相同应变下,动态再结晶体积分数随应变速率的增大而减小,综合考虑动态再结晶晶粒的大小和组织均匀性,较佳的应变速率为0.1 s-1。 The true stress-strain curves of 3003 aluminum alloy during hot deformation were obtained by isothermal compression test with Gleeble-1500 thermal simulator at 400 ℃ and strain rate of 0.01-10.0 s-1. The results show that when the strain rate ε≥1.0 s-1, the actual deformation temperature is higher than the preset temperature, resulting in the deformation heat effect. The critical strain of dynamic recrystallization increases with the increase of strain rate. At higher strain rate (ε≥1.0 s-1), the zigzag fluctuation appears on the flow stress curve and the alloy undergoes discontinuous dynamic crystallization. The effect of strain rate on the microstructure evolution of 3003 aluminum alloy was analyzed by optical microscope and transmission electron microscope. The results show that the smaller the strain rate is, the more easily the alloy recrystallizes. When the strain rate is 10.0 s-1, the alloy recrystallizes dynamically due to the deformation heat effect. Under the condition of low strain rate (ε≤0.1 s-1), increasing the strain rate can obviously refine the grains, and under the same strain, the volume fraction of dynamic recrystallization decreases with the increase of strain rate. Considering dynamic recrystallization The grain size and the homogeneity of the grain, the preferred strain rate is 0.1 s-1.