CAJ | 학술논문

通过热压缩实验，研究挤压态AZ80镁合金在变形温度为250~450°C，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°C。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°C、应变速率0.1 s-1是合金适宜的热变形条件。
통과열압축실험，연구제압태AZ80미합금재변형온도위250~450°C，응변속솔위0.001~10 s-1조건하적열변형행위。채용경과온승수정적류변응력계산해합금적Zener-Hollomon삼수(Z삼수)。결과표명，제압태AZ80미합금괄의적변형조건위응변속솔0.1 s-1、변형온도350~400°C。령외，토론료현미조직연화여Z삼수지간적관계。재고온급저응변속솔(저Z삼수)시，합금발생료완전재결정병산생료대적재결정정립。종합고필가공도화현미조직，변형온도400°C、응변속솔0.1 s-1시합금괄의적열변형조건。
The hot deformation behavior of extruded AZ80 magnesium alloy was studied through hot compression tests performed at temperatures ranging from 250 to 450 °C with strain rates varying from 0.001 to 10 s-1. The flow stress was corrected due to the deformation heating. The Zener-Hollomon parameter (Z parameter) and processing map were established to describe the hot deformation behavior. The results indicate that the applicable deformation should be conducted at the strain rate of 0.1 s-1 and the temperature range of 350-400 °C. Besides, the relationship between the microstructure evolution and Z parameter was also discussed. High temperature and low strain rate result in a low Z parameter, which leads to full dynamic recrystallization (DRX) and large DRX grain size in the microstructure. Considering processing map and microstructure, the hot deformation should be carried out at the temperature of 400 °C and the strain rate of 0.1 s-1.