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通过热压缩实验,研究挤压态AZ80镁合金在变形温度为250~450℃,应变速率为0.001~10 s-1条件下的热变形行为。采用经过温升修正的流变应力计算该合金的Zener-Hollomon参数(Z参数)。结果表明,挤压态AZ80镁合金适宜的变形条件为应变速率0.1 s-1、变形温度350~400℃。另外,讨论了显微组织演化与Z参数之间的关系。在高温及低应变速率(低Z参数)时,合金发生了完全再结晶并产生了大的再结晶晶粒。综合考虑加工图和显微组织,变形温度400℃、应变速率0.1 s-1是合金适宜的热变形条件。
The thermal deformation behavior of extruded AZ80 magnesium alloy was studied by hot compression test at deformation temperature of 250-450 ℃ and strain rate of 0.001-10 s-1. The Zener-Hollomon parameters (Z-parameters) of the alloy were calculated using flow stress corrected for temperature rise. The results show that the suitable deformation conditions of AZ80 magnesium alloy are strain rate 0.1 s-1 and deformation temperature 350-400 ℃. In addition, the relationship between microstructure evolution and Z parameters is discussed. At high temperatures and low strain rates (low Z-parameters), the alloy recrystallizes completely and produces large recrystallized grains. Considering the processing diagram and microstructure, the deformation temperature is 400 ℃ and the strain rate 0.1 s-1 is the suitable thermal deformation condition.