CAJ | 학술논문

目的：采用Instron5500R热模拟试验机，研究铸态AZ80A镁合金在变形温度为270～410℃、应变速率为0．001～0．5 s－1条件下的热加工图及高温变形行为。方法利用双曲正弦本构函数模型描述了铸态AZ80 A镁合金的高温变形行为，计算获得了该合金的变形激活能，构建了应变量为0．3和0．6时的热加工图。结果得到了合金热变形本构模型及加工图，变形激活能为203．5 kJ／mol，确定了应变为0．3和0．6时的动态回复区域为与动态再结晶区域。结论铸态AZ80A镁合金在330～380℃，0．001～0．01 s－1时发生了动态结晶，这是该合金最佳的热加工工艺参数范围。
목적：채용Instron5500R열모의시험궤，연구주태AZ80A미합금재변형온도위270～410℃、응변속솔위0．001～0．5 s－1조건하적열가공도급고온변형행위。방법이용쌍곡정현본구함수모형묘술료주태AZ80 A미합금적고온변형행위，계산획득료해합금적변형격활능，구건료응변량위0．3화0．6시적열가공도。결과득도료합금열변형본구모형급가공도，변형격활능위203．5 kJ／mol，학정료응변위0．3화0．6시적동태회복구역위여동태재결정구역。결론주태AZ80A미합금재330～380℃，0．001～0．01 s－1시발생료동태결정，저시해합금최가적열가공공예삼수범위。
Hot compression tests of as-cast AZ80A magnesium alloy were carried out with the strain rate range of 0.001~0.5 s-1 in the temperature rangeof 270~410℃to study the hot processing maps and hot deformation behavior, using an Instron-5500R testing machine.The hot deformation behavior of as-cast AZ80A magnesium alloy was characterized by the hyperbolic sine relationship and the activation energy was calculated.The hot processing maps were constructed when the strains were 0.3 and 0.6, respectively.Hot deformation constitutive model and the processing maps of as-cast AZ80A mag-nesium alloy were obtained, and the activation energy was 203.5 kJ/mol.The dynamic recovery region and the dynamic re-crystallization region at the strains of 0.3 and 0.6 were determined.Dynamic recrystallization occurred in the temperature and strain rate ranges of 330~380 ℃and 0.001~0.01 s-1 , which were determined as the optimal ranges of the hot pro-cessing parameters.