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在Gleeble 1500D热模拟仪上进行热压缩实验,研究Al-4.7Mg-0.7Mn-0.1Zr-0.4Er合金高温变形行为,变形温度为300~500℃,变形速率为0.001~10 s-1,变形后总应变量为0.7。变形温度高于400℃时,真应力-真应变曲线呈现稳态流变,在其他温度下变形真应力-真应变曲线表现为加工硬化。根据动态材料模型建立合金的加工图,在400~500℃和0.001~0.1 s-1变形时加工图上出现一个发生动态回复的峰区,相应的变形激活能为176 kJ/mol,大于纯铝的自扩散激活能,表明合金在该区域变形的机制是位错的交滑移。变形失稳区的组织特征是局部变形。
Hot compression experiments were carried out on a Gleeble 1500D thermal simulator to investigate the high temperature deformation behavior of Al-4.7Mg-0.7Mn-0.1Zr-0.4Er alloy. The deformation temperature was 300-500 ℃ and the deformation rate was 0.001-10 s-1. After the total should be 0.7. When the deformation temperature is higher than 400 ℃, the true stress-true strain curve shows steady-state flow, and at other temperatures the true stress-true strain curve shows hardening. According to the dynamic material model, a dynamic alloy peak is formed on the processing diagram at 400 ~ 500 ℃ and deformation of 0.001 ~ 0.1 s-1. The corresponding deformation activation energy is 176 kJ / mol, which is larger than pure aluminum The self-diffusion activation energy shows that the mechanism of the alloy deformation in this area is the dislocation cross-slip. Deformation instability zone is characterized by local deformation.