利用Gleeble-3500热模拟试验机对7A55铝合金在300~450°C温度范围和0.01~1 s-1应变速率范围内的热变形行为进行研究。建立了7A55铝合金的热加工图,对该合金的热变形行为进行了遵循幂律关系的动力学速率分析。结果表明:7A55铝合金在410~450°C和0.05~1 s-1的热变形条件下发生了动态再结晶。热加工图的分析结果与动力学分析结果的吻合度较高。动态再结晶及动态回复变形的表观激活能分别为91.2和128.8 kJ/mol,这说明7A55合金的动态再结晶机制为晶界自扩散,而动态回复机制为位错的交滑移。 The hot deformation behavior of 7A55 aluminum alloy in the temperature range of 300 ~ 450 ° C and the strain rate of 0.01 ~ 1 s-1 was investigated by Gleeble-3500 thermal simulation machine. The hot working diagram of 7A55 aluminum alloy was established and the thermal deformation behavior of the alloy was analyzed according to the power law. The results show that the dynamic recrystallization of 7A55 aluminum alloy occurs under the hot deformation of 410 ~ 450 ° C and 0.05 ~ 1 s-1. The results of the thermal processing diagram are in good agreement with the results of the dynamic analysis. The apparent activation energies of dynamic recrystallization and dynamic recovery deformation are 91.2 and 128.8 kJ / mol, respectively. This indicates that the dynamic recrystallization mechanism of 7A55 alloy is self-diffusion of grain boundary, and the dynamic recovery mechanism is the cross-slip of dislocation.